Make blocking_task_runner_ a member variable instead of sequence_token_.

chrome/browser/chromeos/gdata/gdata_system_service.h

 // Copyright (c) 2012 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_CHROMEOS_GDATA_GDATA_SYSTEM_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_SYSTEM_SERVICE_H_
 
+#include <string>
+
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class FilePath;
 
 namespace gdata {
 
@@ skipping 41 matching lines @@
                   const FilePath& cache_root);
 
   // Registers remote file system proxy for drive mount point.
   void AddDriveMountPoint();
   // Unregisters drive mount point from File API.
   void RemoveDriveMountPoint();
 
   friend class GDataSystemServiceFactory;
 
   Profile* profile_;
-  const base::SequencedWorkerPool::SequenceToken sequence_token_;
+  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
   GDataCache* cache_;
   scoped_ptr<DocumentsServiceInterface> documents_service_;
   scoped_ptr<GDataUploader> uploader_;
   scoped_ptr<DriveWebAppsRegistry> webapps_registry_;
   scoped_ptr<GDataFileSystemInterface> file_system_;
   scoped_ptr<GDataDownloadObserver> download_observer_;
   scoped_ptr<GDataSyncClient> sync_client_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataSystemService);
 };
@@ skipping 33 matching lines @@
   virtual ~GDataSystemServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_SYSTEM_SERVICE_H_