Move Singleton and related structs to namespace base

chrome/browser/bookmarks/startup_task_runner_service_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 CHROME_BROWSER_BOOKMARKS_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_BOOKMARKS_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
@@ skipping 10 matching lines @@
     : public BrowserContextKeyedServiceFactory {
  public:
   // Returns the instance of StartupTaskRunnerService associated with this
   // profile (creating one if none exists).
   static bookmarks::StartupTaskRunnerService* GetForProfile(Profile* profile);
 
   // Returns an instance of the StartupTaskRunnerServiceFactory singleton.
   static StartupTaskRunnerServiceFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<StartupTaskRunnerServiceFactory>;
+  friend struct base::DefaultSingletonTraits<StartupTaskRunnerServiceFactory>;
 
   StartupTaskRunnerServiceFactory();
   ~StartupTaskRunnerServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
 
   DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_