chromeos: Remove the last 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 5553ad05d02a2113bb7e08d0faa86fea00078f78..3a47f5215f42e9b39397743b3914f47f3c4da938 100644
--- a/ash/system/tray/system_tray_delegate.cc
+++ b/ash/system/tray/system_tray_delegate.cc
@@ -4,8 +4,6 @@
 
 #include "ash/system/tray/system_tray_delegate.h"
 
-#include "ash/system/tray/ime_info.h"
-
 namespace ash {
 
 SystemTrayDelegate::SystemTrayDelegate() = default;
@@ -16,12 +14,6 @@ void SystemTrayDelegate::Initialize() {}
 
 void SystemTrayDelegate::ShowUserLogin() {}
 
-void SystemTrayDelegate::GetCurrentIME(IMEInfo* info) {}
-
-void SystemTrayDelegate::GetAvailableIMEList(IMEInfoList* list) {}
-
-void SystemTrayDelegate::GetCurrentIMEProperties(IMEPropertyInfoList* list) {}
-
 NetworkingConfigDelegate* SystemTrayDelegate::GetNetworkingConfigDelegate()
     const {
   return nullptr;