SyncFS: Introduce SyncFileSystemBackend

webkit/browser/fileapi/syncable/syncable_file_system_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 "base/stl_util.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/browser/fileapi/file_system_file_util.h"
 #include "webkit/browser/fileapi/file_system_operation_context.h"
 #include "webkit/browser/fileapi/file_system_task_runners.h"
@@ skipping 70 matching lines @@
 
   FileSystemURL URL(const std::string& path) {
     return file_system_.URL(path);
   }
 
   FileSystemContext* file_system_context() {
     return file_system_.file_system_context();
   }
 
   LocalFileChangeTracker* change_tracker() {
-    return file_system_context()->change_tracker();
+    return file_system_.mount_provider()->change_tracker();
   }
 
   ScopedEnableSyncFSDirectoryOperation enable_directory_operation_;
 
   base::ScopedTempDir data_dir_;
   base::MessageLoop message_loop_;
 
   CannedSyncableFileSystem file_system_;
   scoped_refptr<LocalFileSyncContext> sync_context_;
 
@@ skipping 179 matching lines @@
   // Now try copying the directory into the syncable file system, which should
   // fail if directory operation is disabled. (http://crbug.com/161442)
   EXPECT_NE(base::PLATFORM_FILE_OK,
             file_system_.Copy(kSrcDir, URL("dest")));
 
   other_file_system_.TearDown();
   SetEnableSyncFSDirectoryOperation(was_enabled);
 }
 
 }  // namespace sync_file_system