chromeos: Make ash system tray directly observe IME state changes

ash/system/tray/system_tray_notifier.h

Index: ash/system/tray/system_tray_notifier.h
diff --git a/ash/system/tray/system_tray_notifier.h b/ash/system/tray/system_tray_notifier.h
index 540289838dcfbe9ea32dbc451ca7cac99db710a1..2d46746c115aadb95e56c08aeddda97be91aca62 100644
--- a/ash/system/tray/system_tray_notifier.h
+++ b/ash/system/tray/system_tray_notifier.h
@@ -21,7 +21,6 @@ class AccessibilityObserver;
 class BluetoothObserver;
 class ClockObserver;
 class EnterpriseDomainObserver;
-class IMEObserver;
 class LastWindowClosedObserver;
 class LogoutButtonObserver;
 class NetworkObserver;
@@ -68,12 +67,6 @@ class ASH_EXPORT SystemTrayNotifier {
   void RemoveEnterpriseDomainObserver(EnterpriseDomainObserver* observer);
   void NotifyEnterpriseDomainChanged();
 
-  // Input methods.
-  void AddIMEObserver(IMEObserver* observer);
-  void RemoveIMEObserver(IMEObserver* observer);
-  void NotifyRefreshIME();
-  void NotifyRefreshIMEMenu(bool is_active);
-
   // Last window closed.
   void AddLastWindowClosedObserver(LastWindowClosedObserver* observer);
   void RemoveLastWindowClosedObserver(LastWindowClosedObserver* observer);
@@ -137,7 +130,6 @@ class ASH_EXPORT SystemTrayNotifier {
   base::ObserverList<BluetoothObserver> bluetooth_observers_;
   base::ObserverList<ClockObserver> clock_observers_;
   base::ObserverList<EnterpriseDomainObserver> enterprise_domain_observers_;
-  base::ObserverList<IMEObserver> ime_observers_;
   base::ObserverList<LastWindowClosedObserver> last_window_closed_observers_;
   base::ObserverList<LogoutButtonObserver> logout_button_observers_;
   base::ObserverList<NetworkObserver> network_observers_;