Revert of [SyncFS] Post tasks between SyncEngine and SyncWorker

chrome/browser/sync_file_system/drive_backend/register_app_task_unittest.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_backend/register_app_task.h"
 
 #include <vector>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/format_macros.h"
@@ skipping 40 matching lines @@
     drive_uploader_.reset(new drive::DriveUploader(
         fake_drive_service_.get(), base::MessageLoopProxy::current()));
 
     fake_drive_service_helper_.reset(new FakeDriveServiceHelper(
         fake_drive_service_.get(), drive_uploader_.get(),
         kSyncRootFolderTitle));
 
     context_.reset(
         new SyncEngineContext(fake_drive_service_.get(),
                               drive_uploader_.get(),
-                              base::MessageLoopProxy::current(),
                               base::MessageLoopProxy::current()));
 
     ASSERT_EQ(google_apis::HTTP_CREATED,
               fake_drive_service_helper_->AddOrphanedFolder(
                   kSyncRootFolderTitle, &sync_root_folder_id_));
   }
 
   virtual void TearDown() OVERRIDE {
     context_.reset();
     fake_drive_service_.reset();
@@ skipping 237 matching lines @@
 
   CreateMetadataDatabase(db.Pass());
   RunRegisterAppTask(kAppID);
 
   EXPECT_EQ(1u, CountRegisteredAppRoot());
   EXPECT_TRUE(IsAppRegistered(kAppID));
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system