Revert 61462 - Add truncate and cancel for FileWriter; write and more tests will come in later CLs.
This CL also contains a fair amount of plumbing for the write call itself.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/3599011

TBR=ericu@google.com
Review URL: http://codereview.chromium.org/3604006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@61463 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: c9f87ae7ddfa0fc8ca2d20a91572198c42b81b18
diff --git a/base/file_util_proxy.h b/base/file_util_proxy.h
index 32b7863..081c11b 100644
--- a/base/file_util_proxy.h
+++ b/base/file_util_proxy.h
@@ -138,7 +138,7 @@
 
   // Writes to a file. If |offset| is greater than the length of the file,
   // |false| is returned. On success, the file pointer is moved to position
-  // |offset + bytes_to_write| in the file. The callback can be NULL.
+  // |offset + bytes_to_write| in the file. If The callback can be NULL.
   static bool Write(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       base::PlatformFile file,
@@ -169,16 +169,7 @@
   static bool Truncate(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       base::PlatformFile file,
-      int64 length,
-      StatusCallback* callback);
-
-  // Truncates a file to the given length. If |length| is greater than the
-  // current length of the file, the file will be extended with zeroes.
-  // The callback can be NULL.
-  static bool Truncate(
-      scoped_refptr<MessageLoopProxy> message_loop_proxy,
-      const FilePath& path,
-      int64 length,
+      long long length,
       StatusCallback* callback);
 
   // Flushes a file. The callback can be NULL.