[SyncFS] Remove usage of file task runner under drive_backend/

chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_REMOTE_TO_LOCAL_SYNCER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_REMOTE_TO_LOCAL_SYNCER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 155 matching lines @@
   void FinalizeSync(scoped_ptr<SyncTaskToken> token, SyncStatusCode status);
 
   void Prepare(const SyncStatusCallback& callback);
   void DidPrepare(const SyncStatusCallback& callback,
                   SyncStatusCode status,
                   const SyncFileMetadata& metadata,
                   const FileChangeList& changes);
 
   void DeleteLocalFile(const SyncStatusCallback& callback);
   void DownloadFile(const SyncStatusCallback& callback);
-  void DidCreateTemporaryFileForDownload(const SyncStatusCallback& callback,
-                                         webkit_blob::ScopedFile file);
   void DidDownloadFile(const SyncStatusCallback& callback,
                        webkit_blob::ScopedFile file,
                        google_apis::GDataErrorCode error,
                        const base::FilePath&);
-  void DidCalculateMD5ForDownload(const SyncStatusCallback& callback,
-                                  webkit_blob::ScopedFile file,
-                                  const std::string& md5);
   void DidApplyDownload(const SyncStatusCallback& callback,
                         webkit_blob::ScopedFile,
                         SyncStatusCode status);
 
   void CreateFolder(const SyncStatusCallback& callback);
 
   // TODO(tzik): After we convert all callbacks to token-passing style,
   // drop this function.
   SyncStatusCallback SyncCompletedCallback(scoped_ptr<SyncTaskToken> token);
 
@@ skipping 17 matching lines @@
 
   base::WeakPtrFactory<RemoteToLocalSyncer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteToLocalSyncer);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_REMOTE_TO_LOCAL_SYNCER_H_