Remove base/platform_thread.h stub and fix up all callers to use the new location and namespace.

TEST=none
BUG=none

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@70346 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: f214f8797150f49e1233110c1dafe4e8b601d9ea
diff --git a/ipc/ipc_sync_channel_unittest.cc b/ipc/ipc_sync_channel_unittest.cc
index 32969a3..b713c0a 100644
--- a/ipc/ipc_sync_channel_unittest.cc
+++ b/ipc/ipc_sync_channel_unittest.cc
@@ -12,11 +12,11 @@
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
-#include "base/platform_thread.h"
 #include "base/scoped_ptr.h"
 #include "base/stl_util-inl.h"
 #include "base/string_util.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
+#include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "base/waitable_event.h"
 #include "ipc/ipc_message.h"
@@ -1011,7 +1011,7 @@
   explicit NestedTask(Worker* server) : server_(server) { }
   void Run() {
     // Sleep a bit so that we wake up after the reply has been received.
-    PlatformThread::Sleep(250);
+    base::PlatformThread::Sleep(250);
     server_->SendAnswerToLife(true, base::kNoTimeout, true);
   }