ash: Use mojo LocaleNotificationController interface.

ash/common/system/tray/system_tray_notifier.h

Index: ash/common/system/tray/system_tray_notifier.h
diff --git a/ash/common/system/tray/system_tray_notifier.h b/ash/common/system/tray/system_tray_notifier.h
index 29bb9f521061c39977d5f613cee9636c32ef3d10..3051575d263e6ad61aa9dbb845a8df8cef38cd91 100644
--- a/ash/common/system/tray/system_tray_notifier.h
+++ b/ash/common/system/tray/system_tray_notifier.h
@@ -9,7 +9,6 @@
 
 #include "ash/ash_export.h"
 #include "ash/common/accessibility_types.h"
-#include "ash/common/system/locale/locale_observer.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 
@@ -78,14 +77,6 @@ class ASH_EXPORT SystemTrayNotifier {
   void NotifyRefreshIME();
   void NotifyRefreshIMEMenu(bool is_active);
 
-  // Locale.
-  void AddLocaleObserver(LocaleObserver* observer);
-  void RemoveLocaleObserver(LocaleObserver* observer);
-  void NotifyLocaleChanged(LocaleObserver::Delegate* delegate,
-                           const std::string& cur_locale,
-                           const std::string& from_locale,
-                           const std::string& to_locale);
-
   // OS updates.
   void AddUpdateObserver(UpdateObserver* observer);
   void RemoveUpdateObserver(UpdateObserver* observer);
@@ -173,7 +164,6 @@ class ASH_EXPORT SystemTrayNotifier {
   base::ObserverList<AudioObserver> audio_observers_;
   base::ObserverList<ClockObserver> clock_observers_;
   base::ObserverList<IMEObserver> ime_observers_;
-  base::ObserverList<LocaleObserver> locale_observers_;
   base::ObserverList<UpdateObserver> update_observers_;
   base::ObserverList<UserObserver> user_observers_;