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

ash/system/tray/system_tray_delegate.cc

Index: ash/system/tray/system_tray_delegate.cc
diff --git a/ash/system/tray/system_tray_delegate.cc b/ash/system/tray/system_tray_delegate.cc
index a825be27060f5e5b0bc2b265312fa80997a69ca1..f25ec4f3436d89296bc393fee477754c9fda52b9 100644
--- a/ash/system/tray/system_tray_delegate.cc
+++ b/ash/system/tray/system_tray_delegate.cc
@@ -26,6 +26,10 @@
   return base::string16();
 }
 
+void SystemTrayDelegate::SwitchIME(const std::string& ime_id) {}
+
+void SystemTrayDelegate::ActivateIMEProperty(const std::string& key) {}
+
 NetworkingConfigDelegate* SystemTrayDelegate::GetNetworkingConfigDelegate()
     const {
   return nullptr;