chromeos: Make ash system tray directly observe IME state changes

ash/system/tray/system_tray_notifier.cc

Index: ash/system/tray/system_tray_notifier.cc
diff --git a/ash/system/tray/system_tray_notifier.cc b/ash/system/tray/system_tray_notifier.cc
index 6eb56b358688a8ac8509d9ee4a93e7a91af26720..2e4d0aecc75bd9deab079876b5dfb1118331a2c3 100644
--- a/ash/system/tray/system_tray_notifier.cc
+++ b/ash/system/tray/system_tray_notifier.cc
@@ -8,7 +8,6 @@
 #include "ash/system/bluetooth/bluetooth_observer.h"
 #include "ash/system/date/clock_observer.h"
 #include "ash/system/enterprise/enterprise_domain_observer.h"
-#include "ash/system/ime/ime_observer.h"
 #include "ash/system/network/network_observer.h"
 #include "ash/system/network/network_portal_detector_observer.h"
 #include "ash/system/screen_security/screen_capture_observer.h"
@@ -103,24 +102,6 @@ void SystemTrayNotifier::NotifyEnterpriseDomainChanged() {
     observer.OnEnterpriseDomainChanged();
 }
 
-void SystemTrayNotifier::AddIMEObserver(IMEObserver* observer) {
-  ime_observers_.AddObserver(observer);
-}
-
-void SystemTrayNotifier::RemoveIMEObserver(IMEObserver* observer) {
-  ime_observers_.RemoveObserver(observer);
-}
-
-void SystemTrayNotifier::NotifyRefreshIME() {
-  for (auto& observer : ime_observers_)
-    observer.OnIMERefresh();
-}
-
-void SystemTrayNotifier::NotifyRefreshIMEMenu(bool is_active) {
-  for (auto& observer : ime_observers_)
-    observer.OnIMEMenuActivationChanged(is_active);
-}
-
 void SystemTrayNotifier::AddLastWindowClosedObserver(
     LastWindowClosedObserver* observer) {
   last_window_closed_observers_.AddObserver(observer);