Move Singleton and related structs to namespace base

content/browser/webui/content_web_ui_controller_factory.h

 // 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.
 
 #ifndef CONTENT_BROWSER_WEBUI_CONTENT_WEB_UI_CONTROLLER_FACTORY_H_
 #define CONTENT_BROWSER_WEBUI_CONTENT_WEB_UI_CONTROLLER_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/web_ui.h"
@@ skipping 13 matching lines @@
   WebUIController* CreateWebUIControllerForURL(WebUI* web_ui,
                                                const GURL& url) const override;
 
   static ContentWebUIControllerFactory* GetInstance();
 
  protected:
   ContentWebUIControllerFactory();
   ~ContentWebUIControllerFactory() override;
 
  private:
-  friend struct DefaultSingletonTraits<ContentWebUIControllerFactory>;
+  friend struct base::DefaultSingletonTraits<ContentWebUIControllerFactory>;
 
   DISALLOW_COPY_AND_ASSIGN(ContentWebUIControllerFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEBUI_CONTENT_WEB_UI_CONTROLLER_FACTORY_H_