mash: Remove shelf app menu item objects.

ash/common/shelf/shelf_application_menu_model.h

 // Copyright 2017 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_SHELF_APPLICATION_MENU_MODEL_H_
 #define ASH_COMMON_SHELF_SHELF_APPLICATION_MENU_MODEL_H_
 
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/public/cpp/shelf_application_menu_item.h"
 #include "base/macros.h"
 #include "ui/base/models/simple_menu_model.h"
 
+namespace ash {
+
 class ShelfApplicationMenuModelTestAPI;
-
-namespace ash {
+class ShelfItemDelegate;
 
 // A menu model listing open applications associated with a shelf item. Layout:
 // +---------------------------+
 // |                           |
 // |        App Title          |
 // |                           |
 // | [Icon] Item Title         |
 // | [Icon] Item Title         |
 // |                           |
 // +---------------------------+
 class ASH_EXPORT ShelfApplicationMenuModel
     : public ui::SimpleMenuModel,
       public ui::SimpleMenuModel::Delegate {
  public:
-  // Makes a menu with a |title|, separators, and the specified |items|.
+  // Makes a menu with a |title|, separators, and |items| for |delegate|.
+  // |delegate| may be null in unit tests that do not execute commands.
   ShelfApplicationMenuModel(const base::string16& title,
-                            ShelfAppMenuItemList items);
+                            ShelfAppMenuItemList items,
+                            ShelfItemDelegate* delegate);
   ~ShelfApplicationMenuModel() override;
 
   // ui::SimpleMenuModel::Delegate:
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
   void ExecuteCommand(int command_id, int event_flags) override;
 
  private:
   friend class ShelfApplicationMenuModelTestAPI;
 
   // Records UMA metrics when a menu item is selected.
   void RecordMenuItemSelectedMetrics(int command_id,
                                      int num_menu_items_enabled);
 
   // The list of menu items as returned from the shelf item's controller.
   ShelfAppMenuItemList items_;
 
+  // The shelf item delegate that created the menu and executes its commands.
+  ShelfItemDelegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(ShelfApplicationMenuModel);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_APPLICATION_MENU_MODEL_H_