Refactor preference syncing.

chrome/browser/sync/syncable_service_mock.cc

Index: chrome/browser/sync/syncable_service_mock.cc
diff --git a/chrome/browser/sync/syncable_service_mock.cc b/chrome/browser/sync/syncable_service_mock.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3050fde8c15f0934db9206ae369a7a7b23bc2de3
--- /dev/null
+++ b/chrome/browser/sync/syncable_service_mock.cc
@@ -0,0 +1,9 @@
+// Copyright (c) 2011 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/syncable_service_mock.h"
+
+SyncableServiceMock::SyncableServiceMock() {}
+
+SyncableServiceMock::~SyncableServiceMock() {}