mash: Migrate locale observer and notification to common.

ash/common/system/locale/locale_notification_controller.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 ASH_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
-#define ASH_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
+#ifndef ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
+#define ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
 
 #include <string>
 
-#include "ash/system/locale/locale_observer.h"
-#include "base/compiler_specific.h"
+#include "ash/common/system/locale/locale_observer.h"
 #include "base/macros.h"
 
 namespace ash {
 
 // Observes the locale change and creates rich notification for the change.
 class LocaleNotificationController : public LocaleObserver {
  public:
   LocaleNotificationController();
   ~LocaleNotificationController() override;
 
  private:
   // Overridden from LocaleObserver.
   void OnLocaleChanged(LocaleObserver::Delegate* delegate,
                        const std::string& cur_locale,
                        const std::string& from_locale,
                        const std::string& to_locale) override;
 
   std::string cur_locale_;
   std::string from_locale_;
   std::string to_locale_;
 
   DISALLOW_COPY_AND_ASSIGN(LocaleNotificationController);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_
+#endif  // ASH_COMMON_SYSTEM_LOCALE_LOCALE_NOTIFICATION_CONTROLLER_H_