[SyncFS] Make DumpFiles async

chrome/browser/sync_file_system/mock_remote_file_sync_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_SYNC_FILE_SYSTEM_MOCK_REMOTE_FILE_SYNC_SERVICE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_MOCK_REMOTE_FILE_SYNC_SERVICE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 52 matching lines @@
                      ConflictResolutionPolicy(const GURL&));
   MOCK_METHOD2(GetRemoteVersions,
                void(const fileapi::FileSystemURL&,
                     const RemoteVersionsCallback&));
   MOCK_METHOD3(DownloadRemoteVersion,
                void(const fileapi::FileSystemURL&,
                     const std::string&,
                     const DownloadVersionCallback&));
   MOCK_METHOD0(PromoteDemotedChanges, void());
 
-  virtual scoped_ptr<base::ListValue> DumpFiles(const GURL& origin) OVERRIDE;
+  virtual void DumpFiles(const GURL& origin,
+                         const ListCallback& callback) OVERRIDE;
   virtual scoped_ptr<base::ListValue> DumpDatabase() OVERRIDE;
 
   void SetServiceState(RemoteServiceState state);
 
   // Send notifications to the observers.
   // Can be used in the mock implementation.
   void NotifyRemoteChangeQueueUpdated(int64 pending_changes);
   void NotifyRemoteServiceStateUpdated(
       RemoteServiceState state,
       const std::string& description);
@@ skipping 31 matching lines @@
   ConflictResolutionPolicy conflict_resolution_policy_;
 
   RemoteServiceState state_;
 
   DISALLOW_COPY_AND_ASSIGN(MockRemoteFileSyncService);
 };
 
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_MOCK_REMOTE_FILE_SYNC_SERVICE_H_