Move Singleton and related structs to namespace base

content/browser/webui/content_web_ui_controller_factory.cc

 // Copyright (c) 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 "content/browser/webui/content_web_ui_controller_factory.h"
 
 #include "content/browser/accessibility/accessibility_ui.h"
 #include "content/browser/appcache/appcache_internals_ui.h"
 #include "content/browser/gpu/gpu_internals_ui.h"
 #include "content/browser/indexed_db/indexed_db_internals_ui.h"
@@ skipping 66 matching lines @@
 #if defined(ENABLE_WEBRTC)
   if (url.host() == kChromeUIWebRTCInternalsHost)
     return new WebRTCInternalsUI(web_ui);
 #endif
 
   return nullptr;
 }
 
 // static
 ContentWebUIControllerFactory* ContentWebUIControllerFactory::GetInstance() {
-  return Singleton<ContentWebUIControllerFactory>::get();
+  return base::Singleton<ContentWebUIControllerFactory>::get();
 }
 
 ContentWebUIControllerFactory::ContentWebUIControllerFactory() {
 }
 
 ContentWebUIControllerFactory::~ContentWebUIControllerFactory() {
 }
 
 }  // namespace content