Move Singleton and related structs to namespace base

chrome/browser/extensions/api/automation_internal/automation_event_router.h

 // Copyright 2015 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_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_EVENT_ROUTER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_EVENT_ROUTER_H_
 
 #include <vector>
 
 #include "base/memory/singleton.h"
@@ skipping 61 matching lines @@
       bool desktop);
 
   // content::NotificationObserver interface.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   content::NotificationRegistrar registrar_;
   std::vector<AutomationListener> listeners_;
 
-  friend struct DefaultSingletonTraits<AutomationEventRouter>;
+  friend struct base::DefaultSingletonTraits<AutomationEventRouter>;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationEventRouter);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_AUTOMATION_INTERNAL_AUTOMATION_EVENT_ROUTER_H_