Replace string16 with base::string16.

chrome/browser/chromeos/locale_change_guard.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_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 #define CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_
 
 #include <string>
 
 #include "ash/system/locale/locale_observer.h"
@@ skipping 50 matching lines @@
   std::string to_locale_;
   Profile* profile_;
   bool reverted_;
   bool session_started_;
   bool main_frame_loaded_;
   content::NotificationRegistrar registrar_;
 
   // We want to show locale change notification in previous language however
   // we cannot directly load strings for non-current locale.  So we cache
   // messages before locale change.
-  string16 title_text_;
-  string16 message_text_;
-  string16 revert_link_text_;
+  base::string16 title_text_;
+  base::string16 message_text_;
+  base::string16 revert_link_text_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOCALE_CHANGE_GUARD_H_