Revert of chromeos: Remove some IME methods from ash::SystemTrayDelegate

ash/system/tray/system_tray_delegate.h

Index: ash/system/tray/system_tray_delegate.h
diff --git a/ash/system/tray/system_tray_delegate.h b/ash/system/tray/system_tray_delegate.h
index c0e26deb1215c06be33633d78a3545e84719f846..864cc6b6cac44fb4263783a79fc95b2f80c54d7d 100644
--- a/ash/system/tray/system_tray_delegate.h
+++ b/ash/system/tray/system_tray_delegate.h
@@ -56,6 +56,12 @@
   // Returns a non-empty string if IMEs are managed by policy.
   virtual base::string16 GetIMEManagedMessage();
 
+  // Switches to the selected input method.
+  virtual void SwitchIME(const std::string& ime_id);
+
+  // Activates an IME property.
+  virtual void ActivateIMEProperty(const std::string& key);
+
   // Returns NetworkingConfigDelegate. May return nullptr.
   virtual NetworkingConfigDelegate* GetNetworkingConfigDelegate() const;