Move Singleton and related structs to namespace base

chrome/browser/ui/webui/signin/login_ui_service_factory.h

 // Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
@@ skipping 12 matching lines @@
 
   // Returns an instance of the LoginUIServiceFactory singleton.
   static LoginUIServiceFactory* GetInstance();
 
   // Helper method that returns a closure displaying the login popup for
   // |profile|.
   // This closure must not be called after the LoginUIService is destroyed.
   static base::Closure GetShowLoginPopupCallbackForProfile(Profile* profile);
 
  private:
-  friend struct DefaultSingletonTraits<LoginUIServiceFactory>;
+  friend struct base::DefaultSingletonTraits<LoginUIServiceFactory>;
 
   LoginUIServiceFactory();
   ~LoginUIServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
 
   DISALLOW_COPY_AND_ASSIGN(LoginUIServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_LOGIN_UI_SERVICE_FACTORY_H_