mash: Remove shelf app menu item objects.

ash/common/shelf/app_list_shelf_item_delegate.h

 // Copyright 2013 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.
 
 #ifndef ASH_COMMON_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_
 #define ASH_COMMON_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_
 
 #include "ash/common/shelf/shelf_item_delegate.h"
 #include "base/macros.h"
 
 namespace ash {
 class ShelfModel;
 
 // ShelfItemDelegate for TYPE_APP_LIST.
 class AppListShelfItemDelegate : public ShelfItemDelegate {
  public:
   // Initializes the app list item in the shelf data model and creates an
   // AppListShelfItemDelegate which will be owned by |model|.
   static void CreateAppListItemAndDelegate(ShelfModel* model);
 
   AppListShelfItemDelegate();
   ~AppListShelfItemDelegate() override;
 
   // ShelfItemDelegate:
   ShelfAction ItemSelected(ui::EventType event_type,
                            int event_flags,
                            int64_t display_id,
                            ShelfLaunchSource source) override;
   ShelfAppMenuItemList GetAppMenuItems(int event_flags) override;
+  void ExecuteCommand(uint32_t command_id, int event_flags) override;
   void Close() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AppListShelfItemDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_