mash: Use ChromeLauncherControllerImpl, remove Mus subclass stub.

chrome/browser/ui/ash/launcher/launcher_context_menu.cc

 // Copyright 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 "chrome/browser/ui/ash/launcher/launcher_context_menu.h"
 
 #include <string>
 
 #include "ash/shelf/shelf_model.h"
 #include "ash/shelf/wm_shelf.h"
@@ skipping 98 matching lines @@
 }
 
 void LauncherContextMenu::ExecuteCommand(int command_id, int event_flags) {
   switch (static_cast<MenuItem>(command_id)) {
     case MENU_OPEN_NEW:
       controller_->Launch(item_.id, ui::EF_NONE);
       break;
     case MENU_CLOSE:
       if (item_.type == ash::TYPE_DIALOG) {
         ash::ShelfItemDelegate* item_delegate =
-            ash::Shell::Get()->shelf_model()->GetShelfItemDelegate(item_.id);
+            controller_->shelf_model()->GetShelfItemDelegate(item_.id);
         DCHECK(item_delegate);
         item_delegate->Close();
       } else {
         // TODO(simonhong): Use ShelfItemDelegate::Close().
         controller_->Close(item_.id);
       }
       ash::ShellPort::Get()->RecordUserMetricsAction(
           ash::UMA_CLOSE_THROUGH_CONTEXT_MENU);
       break;
     case MENU_PIN:
@@ skipping 71 matching lines @@
     case MENU_PIN:
     case MENU_AUTO_HIDE:
     case MENU_ALIGNMENT_MENU:
     case MENU_CHANGE_WALLPAPER:
       LauncherContextMenu::ExecuteCommand(command_id, event_flags);
       return true;
     default:
       return false;
   }
 }