chromeos: Remove the last IME methods from ash::SystemTrayDelegate

ash/system/ime/tray_ime_chromeos.cc

Index: ash/system/ime/tray_ime_chromeos.cc
diff --git a/ash/system/ime/tray_ime_chromeos.cc b/ash/system/ime/tray_ime_chromeos.cc
index 85165a6752453521867557783ca8cb29d94ec4aa..537a4f1db48feed3c4c7e0b98b2d5596a50cbac1 100644
--- a/ash/system/ime/tray_ime_chromeos.cc
+++ b/ash/system/ime/tray_ime_chromeos.cc
@@ -11,9 +11,9 @@
 #include "ash/shell.h"
 #include "ash/shell_port.h"
 #include "ash/strings/grit/ash_strings.h"
+#include "ash/system/ime/ime_util.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_controller.h"
-#include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_details_view.h"
@@ -215,8 +215,7 @@ bool TrayIME::ShouldShowKeyboardToggle() {
 
 base::string16 TrayIME::GetDefaultViewLabel(bool show_ime_label) {
   if (show_ime_label) {
-    IMEInfo current;
-    Shell::Get()->system_tray_delegate()->GetCurrentIME(&current);
+    IMEInfo current = ime_util::GetCurrentIME();
     return current.name;
   } else {
     // Display virtual keyboard status instead.
@@ -268,12 +267,9 @@ void TrayIME::DestroyDetailedView() {
 
 void TrayIME::OnIMERefresh() {
   // Caches the current ime state.
-  SystemTrayDelegate* delegate = Shell::Get()->system_tray_delegate();
-  ime_list_.clear();
-  property_list_.clear();
-  delegate->GetCurrentIME(&current_ime_);
-  delegate->GetAvailableIMEList(&ime_list_);
-  delegate->GetCurrentIMEProperties(&property_list_);
+  current_ime_ = ime_util::GetCurrentIME();
+  ime_list_ = ime_util::GetAvailableIMEList();
+  property_list_ = ime_util::GetCurrentIMEProperties();
   auto ime_state = InputMethodManager::Get()->GetActiveIMEState();
   ime_managed_message_ =
       ime_state->GetAllowedInputMethods().empty()