ash: Use mojo LocaleNotificationController interface.

ash/common/system/tray/system_tray_notifier.cc

Index: ash/common/system/tray/system_tray_notifier.cc
diff --git a/ash/common/system/tray/system_tray_notifier.cc b/ash/common/system/tray/system_tray_notifier.cc
index 3629b1bde5ff2b8785d6031453afa93459c32c73..ce6746113f42efb597bc168cc158541d50767ffe 100644
--- a/ash/common/system/tray/system_tray_notifier.cc
+++ b/ash/common/system/tray/system_tray_notifier.cc
@@ -125,23 +125,6 @@ void SystemTrayNotifier::NotifyRefreshIMEMenu(bool is_active) {
                     OnIMEMenuActivationChanged(is_active));
 }
 
-void SystemTrayNotifier::AddLocaleObserver(LocaleObserver* observer) {
-  locale_observers_.AddObserver(observer);
-}
-
-void SystemTrayNotifier::RemoveLocaleObserver(LocaleObserver* observer) {
-  locale_observers_.RemoveObserver(observer);
-}
-
-void SystemTrayNotifier::NotifyLocaleChanged(LocaleObserver::Delegate* delegate,
-                                             const std::string& cur_locale,
-                                             const std::string& from_locale,
-                                             const std::string& to_locale) {
-  FOR_EACH_OBSERVER(
-      LocaleObserver, locale_observers_,
-      OnLocaleChanged(delegate, cur_locale, from_locale, to_locale));
-}
-
 void SystemTrayNotifier::AddUpdateObserver(UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }