chromeos: Refactor system tray "show settings" commands to use mojo

ash/common/system/ime/tray_ime_chromeos.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/system/ime/tray_ime_chromeos.h"
 
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/chromeos/ime_menu/ime_list_view.h"
 #include "ash/common/system/tray/hover_highlight_view.h"
 #include "ash/common/system/tray/system_tray.h"
+#include "ash/common/system/tray/system_tray_controller.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
 #include "ash/common/system/tray/system_tray_notifier.h"
 #include "ash/common/system/tray/tray_constants.h"
 #include "ash/common/system/tray/tray_details_view.h"
 #include "ash/common/system/tray/tray_item_more.h"
 #include "ash/common/system/tray/tray_item_view.h"
 #include "ash/common/system/tray/tray_popup_item_style.h"
 #include "ash/common/system/tray/tray_utils.h"
 #include "ash/common/system/tray_accessibility.h"
 #include "ash/common/wm_shell.h"
@@ skipping 116 matching lines @@
     CreateTitleRow(IDS_ASH_STATUS_TRAY_IME);
   }
 
  private:
   // ImeListView:
   void HandleViewClicked(views::View* view) override {
     ImeListView::HandleViewClicked(view);
     if (view == settings_) {
       WmShell::Get()->RecordUserMetricsAction(
           UMA_STATUS_AREA_IME_SHOW_DETAILED);
-      WmShell::Get()->system_tray_delegate()->ShowIMESettings();
+      WmShell::Get()->system_tray_controller()->ShowIMESettings();
     }
   }
 
   void AppendSettings() {
     HoverHighlightView* container = new HoverHighlightView(this);
     container->AddLabel(
         ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
             IDS_ASH_STATUS_TRAY_IME_SETTINGS),
         gfx::ALIGN_LEFT, false /* highlight */);
     AddChildView(container);
@@ skipping 151 matching lines @@
   else
     Update();
 }
 
 bool TrayIME::ShouldDefaultViewBeVisible() {
   return is_visible_ && (ime_list_.size() > 1 || property_list_.size() > 1 ||
                          ShouldShowKeyboardToggle());
 }
 
 }  // namespace ash