[Sync] Rename syncable_prefs to sync_preferences.

components/sync_preferences/pref_service_mock_factory.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 "components/syncable_prefs/pref_service_mock_factory.h"
+#include "components/sync_preferences/pref_service_mock_factory.h"
 
 #include "components/prefs/testing_pref_store.h"
 
-namespace syncable_prefs {
+namespace sync_preferences {
 
 PrefServiceMockFactory::PrefServiceMockFactory() {
-    user_prefs_ = new TestingPrefStore;
+  user_prefs_ = new TestingPrefStore;
 }
 
 PrefServiceMockFactory::~PrefServiceMockFactory() {}
 
-}  // namespace syncable_prefs
+}  // namespace sync_preferences