Suppress sequence checks in SyncFileSystem on the shutdown phase

chrome/browser/sync_file_system/drive_backend/sync_worker.cc

 // Copyright 2014 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/sync_worker.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "chrome/browser/drive/drive_service_interface.h"
@@ skipping 55 matching lines @@
 }
 
 void SyncWorker::Initialize(scoped_ptr<SyncEngineContext> context) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
   DCHECK(!task_manager_);
 
   context_ = context.Pass();
 
   task_manager_.reset(new SyncTaskManager(
       weak_ptr_factory_.GetWeakPtr(), 0 /* maximum_background_task */,
-      context_->GetWorkerTaskRunner()));
+      context_->GetWorkerTaskRunner(),
+      context_->GetWorkerPool()));
   task_manager_->Initialize(SYNC_STATUS_OK);
 
   PostInitializeTask();
 }
 
 void SyncWorker::RegisterOrigin(
     const GURL& origin,
     const SyncStatusCallback& callback) {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
 
@@ skipping 627 matching lines @@
   return context_->GetDriveUploader();
 }
 
 MetadataDatabase* SyncWorker::GetMetadataDatabase() {
   DCHECK(sequence_checker_.CalledOnValidSequencedThread());
   return context_->GetMetadataDatabase();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system