content/browser/storage_partition_impl.cc

// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/storage_partition_impl.h"

#include "base/sequenced_task_runner.h"
#include "base/strings/utf_string_conversions.h"
#include "content/browser/browser_main_loop.h"
#include "content/browser/fileapi/browser_file_system_helper.h"
#include "content/browser/gpu/shader_disk_cache.h"
#include "content/common/dom_storage/dom_storage_types.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/dom_storage_context.h"
#include "content/public/browser/indexed_db_context.h"
#include "content/public/browser/local_storage_usage_info.h"
#include "content/public/browser/session_storage_usage_info.h"
#include "net/base/completion_callback.h"
#include "net/base/net_errors.h"
#include "net/cookies/cookie_monster.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"
#include "webkit/browser/database/database_tracker.h"
#include "webkit/browser/quota/quota_manager.h"

namespace content {

namespace {

int GenerateQuotaClientMask(uint32 remove_mask) {
  int quota_client_mask = 0;

  if (remove_mask & StoragePartition::REMOVE_DATA_MASK_FILE_SYSTEMS)
    quota_client_mask |= quota::QuotaClient::kFileSystem;
  if (remove_mask & StoragePartition::REMOVE_DATA_MASK_WEBSQL)
    quota_client_mask |= quota::QuotaClient::kDatabase;
  if (remove_mask & StoragePartition::REMOVE_DATA_MASK_APPCACHE)
    quota_client_mask |= quota::QuotaClient::kAppcache;
  if (remove_mask & StoragePartition::REMOVE_DATA_MASK_INDEXEDDB)
    quota_client_mask |= quota::QuotaClient::kIndexedDatabase;

  return quota_client_mask;
}

void OnClearedCookies(const base::Closure& callback, int num_deleted) {
  // The final callback needs to happen from UI thread.
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&OnClearedCookies, callback, num_deleted));
    return;
  }

  callback.Run();
}

void ClearCookiesOnIOThread(
    const scoped_refptr<net::URLRequestContextGetter>& rq_context,
    const base::Time begin,
    const base::Time end,
    const GURL& remove_origin,
    const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  net::CookieStore* cookie_store = rq_context->
      GetURLRequestContext()->cookie_store();
  if (remove_origin.is_empty()) {
    cookie_store->GetCookieMonster()->DeleteAllCreatedBetweenAsync(
        begin,
        end,
        base::Bind(&OnClearedCookies, callback));
  } else {
    cookie_store->GetCookieMonster()->DeleteAllCreatedBetweenForHostAsync(
        begin,
        end,
        remove_origin, base::Bind(&OnClearedCookies, callback));
  }
}

void OnQuotaManagedOriginDeleted(const GURL& origin,
                                 quota::StorageType type,
                                 size_t* origins_to_delete_count,
                                 const base::Closure& callback,
                                 quota::QuotaStatusCode status) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  DCHECK_GT(*origins_to_delete_count, 0u);
  if (status != quota::kQuotaStatusOk) {
    DLOG(ERROR) << "Couldn't remove data of type " << type << " for origin "
                << origin << ". Status: " << status;
  }

  (*origins_to_delete_count)--;
  if (*origins_to_delete_count == 0) {
    delete origins_to_delete_count;
    callback.Run();
  }
}

void ClearQuotaManagedOriginsOnIOThread(quota::QuotaManager* quota_manager,
                                        uint32 remove_mask,
                                        const base::Closure& callback,
                                        const std::set<GURL>& origins,
                                        quota::StorageType quota_storage_type) {
  // The QuotaManager manages all storage other than cookies, LocalStorage,
  // and SessionStorage. This loop wipes out most HTML5 storage for the given
  // origins.
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

  if (!origins.size()) {
    // No origins to clear.
    callback.Run();
    return;
  }

  std::set<GURL>::const_iterator origin;
  size_t* origins_to_delete_count = new size_t(origins.size());
  for (std::set<GURL>::const_iterator origin = origins.begin();
       origin != origins.end(); ++origin) {
    quota_manager->DeleteOriginData(
        *origin, quota_storage_type,
        GenerateQuotaClientMask(remove_mask),
        base::Bind(&OnQuotaManagedOriginDeleted,
                   origin->GetOrigin(), quota_storage_type,
                   origins_to_delete_count, callback));
  }
}

void ClearedShaderCache(const base::Closure& callback) {
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&ClearedShaderCache, callback));
    return;
  }
  callback.Run();
}

void ClearShaderCacheOnIOThread(const base::FilePath& path,
                                const base::Time begin,
                                const base::Time end,
                                const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  ShaderCacheFactory::GetInstance()->ClearByPath(
      path, begin, end, base::Bind(&ClearedShaderCache, callback));
}

void OnLocalStorageUsageInfo(
    const scoped_refptr<DOMStorageContextWrapper>& dom_storage_context,
    const base::Time delete_begin,
    const base::Time delete_end,
    const base::Closure& callback,
    const std::vector<LocalStorageUsageInfo>& infos) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  for (size_t i = 0; i < infos.size(); ++i) {
    if (infos[i].last_modified >= delete_begin &&
        infos[i].last_modified <= delete_end) {
      dom_storage_context->DeleteLocalStorage(infos[i].origin);
    }
  }
  callback.Run();
}

void OnSessionStorageUsageInfo(
    const scoped_refptr<DOMStorageContextWrapper>& dom_storage_context,
    const base::Closure& callback,
    const std::vector<SessionStorageUsageInfo>& infos) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  for (size_t i = 0; i < infos.size(); ++i)
    dom_storage_context->DeleteSessionStorage(infos[i]);

  callback.Run();
}

void ClearLocalStorageOnUIThread(
    const scoped_refptr<DOMStorageContextWrapper>& dom_storage_context,
    const GURL& remove_origin,
    const base::Time begin,
    const base::Time end,
    const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  if (!remove_origin.is_empty()) {
    dom_storage_context->DeleteLocalStorage(remove_origin);
    callback.Run();
    return;
  }

  dom_storage_context->GetLocalStorageUsage(
      base::Bind(&OnLocalStorageUsageInfo,
                 dom_storage_context, begin, end, callback));
}

void ClearSessionStorageOnUIThread(
    const scoped_refptr<DOMStorageContextWrapper>& dom_storage_context,
    const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  dom_storage_context->GetSessionStorageUsage(
      base::Bind(&OnSessionStorageUsageInfo, dom_storage_context, callback));
}

}  // namespace

// Helper for deleting quota managed data from a partition.
//
// Most of the operations in this class are done on IO thread.
struct StoragePartitionImpl::QuotaManagedDataDeletionHelper {
  QuotaManagedDataDeletionHelper(const base::Closure& callback)
      : callback(callback), task_count(0) {
  }

  void IncrementTaskCountOnIO();
  void DecrementTaskCountOnIO();

  void ClearDataOnIOThread(
      const scoped_refptr<quota::QuotaManager>& quota_manager,
      const base::Time begin,
      uint32 remove_mask,
      uint32 quota_storage_remove_mask,
      const GURL& remove_origin);

  // Accessed on IO thread.
  const base::Closure callback;
  // Accessed on IO thread.
  int task_count;
};

// Helper for deleting all sorts of data from a partition, keeps track of
// deletion status.
//
// StoragePartitionImpl creates an instance of this class to keep track of
// data deletion progress. Deletion requires deleting multiple bits of data
// (e.g. cookies, local storage, session storage etc.) and hopping between UI
// and IO thread. An instance of this class is created in the beginning of
// deletion process (StoragePartitionImpl::ClearDataImpl) and the instance is
// forwarded and updated on each (sub) deletion's callback. The instance is
// finally destroyed when deletion completes (and |callback| is invoked).
struct StoragePartitionImpl::DataDeletionHelper {
  DataDeletionHelper(const base::Closure& callback)
      : callback(callback), task_count(0) {
  }

  void IncrementTaskCountOnUI();
  void DecrementTaskCountOnUI();

  void ClearDataOnUIThread(uint32 remove_mask,
                           uint32 quota_storage_remove_mask,
                           const GURL& remove_origin,
                           const base::FilePath& path,
                           net::URLRequestContextGetter* rq_context,
                           DOMStorageContextWrapper* dom_storage_context,
                           quota::QuotaManager* quota_manager,
                           const base::Time begin,
                           const base::Time end);

  // Accessed on UI thread.
  const base::Closure callback;
  // Accessed on UI thread.
  int task_count;
};

void ClearQuotaManagedDataOnIOThread(
    const scoped_refptr<quota::QuotaManager>& quota_manager,
    const base::Time begin,
    uint32 remove_mask,
    uint32 quota_storage_remove_mask,
    const GURL& remove_origin,
    const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

  StoragePartitionImpl::QuotaManagedDataDeletionHelper* helper =
      new StoragePartitionImpl::QuotaManagedDataDeletionHelper(callback);
  helper->ClearDataOnIOThread(quota_manager, begin,
      remove_mask, quota_storage_remove_mask, remove_origin);
}

StoragePartitionImpl::StoragePartitionImpl(
    const base::FilePath& partition_path,
    quota::QuotaManager* quota_manager,
    ChromeAppCacheService* appcache_service,
    fileapi::FileSystemContext* filesystem_context,
    webkit_database::DatabaseTracker* database_tracker,
    DOMStorageContextWrapper* dom_storage_context,
    IndexedDBContextImpl* indexed_db_context,
    scoped_ptr<WebRTCIdentityStore> webrtc_identity_store)
    : partition_path_(partition_path),
      quota_manager_(quota_manager),
      appcache_service_(appcache_service),
      filesystem_context_(filesystem_context),
      database_tracker_(database_tracker),
      dom_storage_context_(dom_storage_context),
      indexed_db_context_(indexed_db_context),
      webrtc_identity_store_(webrtc_identity_store.Pass()) {}

StoragePartitionImpl::~StoragePartitionImpl() {
  // These message loop checks are just to avoid leaks in unittests.
  if (GetDatabaseTracker() &&
      BrowserThread::IsMessageLoopValid(BrowserThread::FILE)) {
    BrowserThread::PostTask(
        BrowserThread::FILE, FROM_HERE,
        base::Bind(&webkit_database::DatabaseTracker::Shutdown,
                   GetDatabaseTracker()));
  }

  if (GetDOMStorageContext())
    GetDOMStorageContext()->Shutdown();
}

// TODO(ajwong): Break the direct dependency on |context|. We only
// need 3 pieces of info from it.
StoragePartitionImpl* StoragePartitionImpl::Create(
    BrowserContext* context,
    bool in_memory,
    const base::FilePath& partition_path) {
  // Ensure that these methods are called on the UI thread, except for
  // unittests where a UI thread might not have been created.
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
         !BrowserThread::IsMessageLoopValid(BrowserThread::UI));

  // All of the clients have to be created and registered with the
  // QuotaManager prior to the QuotaManger being used. We do them
  // all together here prior to handing out a reference to anything
  // that utilizes the QuotaManager.
  scoped_refptr<quota::QuotaManager> quota_manager = new quota::QuotaManager(
      in_memory,
      partition_path,
      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::DB).get(),
      context->GetSpecialStoragePolicy());

  // Each consumer is responsible for registering its QuotaClient during
  // its construction.
  scoped_refptr<fileapi::FileSystemContext> filesystem_context =
      CreateFileSystemContext(context,
                              partition_path, in_memory,
                              quota_manager->proxy());

  scoped_refptr<webkit_database::DatabaseTracker> database_tracker =
      new webkit_database::DatabaseTracker(
          partition_path,
          in_memory,
          context->GetSpecialStoragePolicy(),
          quota_manager->proxy(),
          BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE)
              .get());

  base::FilePath path = in_memory ? base::FilePath() : partition_path;
  scoped_refptr<DOMStorageContextWrapper> dom_storage_context =
      new DOMStorageContextWrapper(path, context->GetSpecialStoragePolicy());

  // BrowserMainLoop may not be initialized in unit tests. Tests will
  // need to inject their own task runner into the IndexedDBContext.
  base::SequencedTaskRunner* idb_task_runner =
      BrowserThread::CurrentlyOn(BrowserThread::UI) &&
              BrowserMainLoop::GetInstance()
          ? BrowserMainLoop::GetInstance()->indexed_db_thread()
                ->message_loop_proxy().get()
          : NULL;
  scoped_refptr<IndexedDBContextImpl> indexed_db_context =
      new IndexedDBContextImpl(path,
                               context->GetSpecialStoragePolicy(),
                               quota_manager->proxy(),
                               idb_task_runner);

  scoped_refptr<ChromeAppCacheService> appcache_service =
      new ChromeAppCacheService(quota_manager->proxy());

  scoped_ptr<WebRTCIdentityStore> webrtc_identity_store(
      new WebRTCIdentityStore());

  return new StoragePartitionImpl(partition_path,
                                  quota_manager.get(),
                                  appcache_service.get(),
                                  filesystem_context.get(),
                                  database_tracker.get(),
                                  dom_storage_context.get(),
                                  indexed_db_context.get(),
                                  webrtc_identity_store.Pass());
}

base::FilePath StoragePartitionImpl::GetPath() {
  return partition_path_;
}

net::URLRequestContextGetter* StoragePartitionImpl::GetURLRequestContext() {
  return url_request_context_.get();
}

net::URLRequestContextGetter*
StoragePartitionImpl::GetMediaURLRequestContext() {
  return media_url_request_context_.get();
}

quota::QuotaManager* StoragePartitionImpl::GetQuotaManager() {
  return quota_manager_.get();
}

ChromeAppCacheService* StoragePartitionImpl::GetAppCacheService() {
  return appcache_service_.get();
}

fileapi::FileSystemContext* StoragePartitionImpl::GetFileSystemContext() {
  return filesystem_context_.get();
}

webkit_database::DatabaseTracker* StoragePartitionImpl::GetDatabaseTracker() {
  return database_tracker_.get();
}

DOMStorageContextWrapper* StoragePartitionImpl::GetDOMStorageContext() {
  return dom_storage_context_.get();
}

IndexedDBContextImpl* StoragePartitionImpl::GetIndexedDBContext() {
  return indexed_db_context_.get();
}

void StoragePartitionImpl::ClearDataImpl(
    uint32 remove_mask,
    uint32 quota_storage_remove_mask,
    const GURL& remove_origin,
    net::URLRequestContextGetter* rq_context,
    const base::Time begin,
    const base::Time end,
    const base::Closure& callback) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  DataDeletionHelper* helper = new DataDeletionHelper(callback);
  // |helper| deletes itself when done in
  // DataDeletionHelper::DecrementTaskCountOnUI().
  helper->ClearDataOnUIThread(
      remove_mask, quota_storage_remove_mask, remove_origin,
      GetPath(), rq_context, dom_storage_context_, quota_manager_, begin, end);
}

void StoragePartitionImpl::
    QuotaManagedDataDeletionHelper::IncrementTaskCountOnIO() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  ++task_count;
}

void StoragePartitionImpl::
    QuotaManagedDataDeletionHelper::DecrementTaskCountOnIO() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  DCHECK_GT(task_count, 0);
  --task_count;
  if (task_count)
    return;

  callback.Run();
  delete this;
}

void StoragePartitionImpl::QuotaManagedDataDeletionHelper::ClearDataOnIOThread(
    const scoped_refptr<quota::QuotaManager>& quota_manager,
    const base::Time begin,
    uint32 remove_mask,
    uint32 quota_storage_remove_mask,
    const GURL& remove_origin) {
  std::set<GURL> origins;
  if (!remove_origin.is_empty())
    origins.insert(remove_origin);

  IncrementTaskCountOnIO();
  base::Closure decrement_callback = base::Bind(
      &QuotaManagedDataDeletionHelper::DecrementTaskCountOnIO,
      base::Unretained(this));

  if (quota_storage_remove_mask & QUOTA_MANAGED_STORAGE_MASK_PERSISTENT) {
    IncrementTaskCountOnIO();
    if (origins.empty()) {  // Remove for all origins.
      // Ask the QuotaManager for all origins with temporary quota modified
      // within the user-specified timeframe, and deal with the resulting set in
      // ClearQuotaManagedOriginsOnIOThread().
      quota_manager->GetOriginsModifiedSince(
          quota::kStorageTypePersistent, begin,
          base::Bind(&ClearQuotaManagedOriginsOnIOThread,
                     quota_manager, remove_mask, decrement_callback));
    } else {
      ClearQuotaManagedOriginsOnIOThread(
          quota_manager, remove_mask, decrement_callback,
          origins, quota::kStorageTypePersistent);
    }
  }

  // Do the same for temporary quota.
  if (quota_storage_remove_mask & QUOTA_MANAGED_STORAGE_MASK_TEMPORARY) {
    IncrementTaskCountOnIO();
    if (origins.empty()) {  // Remove for all origins.
      quota_manager->GetOriginsModifiedSince(
          quota::kStorageTypeTemporary, begin,
          base::Bind(&ClearQuotaManagedOriginsOnIOThread,
                     quota_manager, remove_mask, decrement_callback));
    } else {
      ClearQuotaManagedOriginsOnIOThread(
          quota_manager, remove_mask, decrement_callback,
          origins, quota::kStorageTypeTemporary);
    }
  }

  // Do the same for syncable quota.
  if (quota_storage_remove_mask & QUOTA_MANAGED_STORAGE_MASK_SYNCABLE) {
    IncrementTaskCountOnIO();
    if (origins.empty()) {  // Remove for all origins.
      quota_manager->GetOriginsModifiedSince(
          quota::kStorageTypeSyncable, begin,
          base::Bind(&ClearQuotaManagedOriginsOnIOThread,
                     quota_manager, remove_mask, decrement_callback));
    } else {
      ClearQuotaManagedOriginsOnIOThread(
          quota_manager, remove_mask, decrement_callback,
          origins, quota::kStorageTypeSyncable);
    }
  }

  DecrementTaskCountOnIO();
}

void StoragePartitionImpl::DataDeletionHelper::IncrementTaskCountOnUI() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  ++task_count;
}

void StoragePartitionImpl::DataDeletionHelper::DecrementTaskCountOnUI() {
  if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::Bind(&DataDeletionHelper::DecrementTaskCountOnUI,
                   base::Unretained(this)));
    return;
  }
  DCHECK_GT(task_count, 0);
  --task_count;
  if (!task_count) {
    callback.Run();
    delete this;
  }
}

void StoragePartitionImpl::DataDeletionHelper::ClearDataOnUIThread(
    uint32 remove_mask,
    uint32 quota_storage_remove_mask,
    const GURL& remove_origin,
    const base::FilePath& path,
    net::URLRequestContextGetter* rq_context,
    DOMStorageContextWrapper* dom_storage_context,
    quota::QuotaManager* quota_manager,
    const base::Time begin,
    const base::Time end) {
  DCHECK_NE(remove_mask, 0u);
  DCHECK(!callback.is_null());

  IncrementTaskCountOnUI();
  base::Closure decrement_callback = base::Bind(
      &DataDeletionHelper::DecrementTaskCountOnUI, base::Unretained(this));

  if (remove_mask & REMOVE_DATA_MASK_COOKIES) {
    // Handle the cookies.
    IncrementTaskCountOnUI();
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ClearCookiesOnIOThread,
                   make_scoped_refptr(rq_context), begin, end, remove_origin,
                   decrement_callback));
  }

  if (remove_mask & REMOVE_DATA_MASK_INDEXEDDB ||
      remove_mask & REMOVE_DATA_MASK_WEBSQL ||
      remove_mask & REMOVE_DATA_MASK_APPCACHE ||
      remove_mask & REMOVE_DATA_MASK_FILE_SYSTEMS) {
    IncrementTaskCountOnUI();
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ClearQuotaManagedDataOnIOThread,
                   make_scoped_refptr(quota_manager), begin,
                   remove_mask, quota_storage_remove_mask, remove_origin,
                   decrement_callback));
  }

  if (remove_mask & REMOVE_DATA_MASK_LOCAL_STORAGE) {
    IncrementTaskCountOnUI();
    ClearLocalStorageOnUIThread(
        make_scoped_refptr(dom_storage_context),
        remove_origin, begin, end, decrement_callback);

    // ClearDataImpl cannot clear session storage data when a particular origin
    // is specified. Therefore we ignore clearing session storage in this case.
    // TODO(lazyboy): Fix.
    if (remove_origin.is_empty()) {
      IncrementTaskCountOnUI();
      ClearSessionStorageOnUIThread(
          make_scoped_refptr(dom_storage_context), decrement_callback);
    }
  }

  if (remove_mask & REMOVE_DATA_MASK_SHADER_CACHE) {
    IncrementTaskCountOnUI();
    BrowserThread::PostTask(
        BrowserThread::IO, FROM_HERE,
        base::Bind(&ClearShaderCacheOnIOThread,
                   path, begin, end, decrement_callback));
  }

  DecrementTaskCountOnUI();
}


void StoragePartitionImpl::ClearDataForOrigin(
    uint32 remove_mask,
    uint32 quota_storage_remove_mask,
    const GURL& storage_origin,
    net::URLRequestContextGetter* request_context_getter) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  ClearDataImpl(remove_mask, quota_storage_remove_mask, storage_origin,
                request_context_getter, base::Time(), base::Time::Max(),
                base::Bind(&base::DoNothing));
}

void StoragePartitionImpl::ClearDataForUnboundedRange(
    uint32 remove_mask,
    uint32 quota_storage_remove_mask) {
  ClearDataImpl(remove_mask, quota_storage_remove_mask, GURL(),
                GetURLRequestContext(), base::Time(), base::Time::Max(),
                base::Bind(&base::DoNothing));
}

void StoragePartitionImpl::ClearDataForRange(uint32 remove_mask,
                                             uint32 quota_storage_remove_mask,
                                             const base::Time& begin,
                                             const base::Time& end,
                                             const base::Closure& callback) {
  ClearDataImpl(remove_mask, quota_storage_remove_mask, GURL(),
                GetURLRequestContext(), begin, end, callback);
}

WebRTCIdentityStore* StoragePartitionImpl::GetWebRTCIdentityStore() {
  return webrtc_identity_store_.get();
}

void StoragePartitionImpl::SetURLRequestContext(
    net::URLRequestContextGetter* url_request_context) {
  url_request_context_ = url_request_context;
}

void StoragePartitionImpl::SetMediaURLRequestContext(
    net::URLRequestContextGetter* media_url_request_context) {
  media_url_request_context_ = media_url_request_context;
}

}  // namespace content