Move Singleton and related structs to namespace base

chrome/browser/sessions/session_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_SESSIONS_SESSION_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_SERVICE_FACTORY_H_
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_service.h"
@@ skipping 37 matching lines @@
                                 scoped_ptr<SessionService> service) {
     GetInstance()->BrowserContextShutdown(profile);
     GetInstance()->BrowserContextDestroyed(profile);
     GetInstance()->Associate(profile, service.Pass());
   }
 #endif
 
   static SessionServiceFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<SessionServiceFactory>;
+  friend struct base::DefaultSingletonTraits<SessionServiceFactory>;
   FRIEND_TEST_ALL_PREFIXES(SessionCrashedInfoBarDelegateUnitTest,
                            DetachingTabWithCrashedInfoBar);
 
   SessionServiceFactory();
   ~SessionServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
   bool ServiceIsCreatedWithBrowserContext() const override;
   bool ServiceIsNULLWhileTesting() const override;
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_SERVICE_FACTORY_H_