Move Singleton and related structs to namespace base

chrome/browser/profiles/gaia_info_update_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_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
@@ skipping 11 matching lines @@
  public:
   // Returns the instance of GAIAInfoUpdateService associated with this profile
   // (creating one if none exists). Returns NULL if this profile cannot have a
   // GAIAInfoUpdateService (for example, if |profile| is incognito).
   static GAIAInfoUpdateService* GetForProfile(Profile* profile);
 
   // Returns an instance of the GAIAInfoUpdateServiceFactory singleton.
   static GAIAInfoUpdateServiceFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<GAIAInfoUpdateServiceFactory>;
+  friend struct base::DefaultSingletonTraits<GAIAInfoUpdateServiceFactory>;
 
   GAIAInfoUpdateServiceFactory();
   ~GAIAInfoUpdateServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 
   void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
   bool ServiceIsNULLWhileTesting() const override;
 
   DISALLOW_COPY_AND_ASSIGN(GAIAInfoUpdateServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_GAIA_INFO_UPDATE_SERVICE_FACTORY_H_