Move Singleton and related structs to namespace base

chrome/browser/android/logo_service.h

 // Copyright 2014 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_ANDROID_LOGO_SERVICE_H_
 #define CHROME_BROWSER_ANDROID_LOGO_SERVICE_H_
 
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 #include "components/keyed_service/core/keyed_service.h"
@@ skipping 25 matching lines @@
 };
 
 // Singleton that owns all LogoServices and associates them with Profiles.
 class LogoServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   static LogoService* GetForProfile(Profile* profile);
 
   static LogoServiceFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<LogoServiceFactory>;
+  friend struct base::DefaultSingletonTraits<LogoServiceFactory>;
 
   LogoServiceFactory();
   ~LogoServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
 };
 
 #endif  // CHROME_BROWSER_ANDROID_LOGO_SERVICE_H_