Move Singleton and related structs to namespace base

chrome/browser/extensions/api/braille_display_private/braille_controller_brlapi.h

 // Copyright 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_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_
 
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/gtest_prod_util.h"
@@ skipping 61 matching lines @@
   bool started_connecting_;
   bool connect_scheduled_;
   base::Time retry_connect_horizon_;
 
   // Manipulated on the UI thread.
   base::ObserverList<BrailleObserver> observers_;
 
   // Manipulated on the FILE thread.
   base::FilePathWatcher file_path_watcher_;
 
-  friend struct DefaultSingletonTraits<BrailleControllerImpl>;
+  friend struct base::DefaultSingletonTraits<BrailleControllerImpl>;
 
   DISALLOW_COPY_AND_ASSIGN(BrailleControllerImpl);
 };
 
 }  // namespace braille_display_private
 }  // namespace api
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BRAILLE_DISPLAY_PRIVATE_BRAILLE_CONTROLLER_BRLAPI_H_