Split gdata_file_system_interface.h from gdata_file_system.h

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 "base/memory/scoped_ptr.h"
-#include "chrome/browser/chromeos/gdata/gdata_file_system.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"
 
 namespace gdata {
 
 class DocumentsServiceInterface;
 class DriveWebAppsRegistry;
+class GDataCache;
 class GDataDownloadObserver;
 class GDataFileSystem;
 class GDataSyncClient;
 class GDataUploader;
 
 // GDataSystemService runs the GData system, including the GData file system
 // implementation for the file manager, and some other sub systems.
 //
 // The class is essentially a container that manages lifetime of the objects
 // that are used to run the GData system. The GDataSystemService object is
@@ skipping 67 matching lines @@
   virtual ~GDataSystemServiceFactory();
 
   // ProfileKeyedServiceFactory:
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_SYSTEM_SERVICE_H_