Componentize PrefSyncableService and support classes.

chrome/browser/prefs/pref_service_mock_factory.cc

Index: chrome/browser/prefs/pref_service_mock_factory.cc
diff --git a/chrome/browser/prefs/pref_service_mock_factory.cc b/chrome/browser/prefs/pref_service_mock_factory.cc
deleted file mode 100644
index 2bad841cd8b55ca6e79c05a9fcfe050995355e75..0000000000000000000000000000000000000000
--- a/chrome/browser/prefs/pref_service_mock_factory.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// 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 "chrome/browser/prefs/pref_service_mock_factory.h"
-
-#include "base/prefs/testing_pref_store.h"
-
-PrefServiceMockFactory::PrefServiceMockFactory() {
-    user_prefs_ = new TestingPrefStore;
-}
-
-PrefServiceMockFactory::~PrefServiceMockFactory() {}