mash: Migrate shelf app list button to wm common types

ash/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_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_
-#define ASH_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_
-
-#include "ash/common/shelf/shelf_item_delegate.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-
-namespace ash {
-
-// ShelfItemDelegate for TYPE_APP_LIST.
-class AppListShelfItemDelegate : public ShelfItemDelegate {
- public:
-  AppListShelfItemDelegate();
-
-  ~AppListShelfItemDelegate() override;
-
-  // ShelfItemDelegate:
-  ShelfItemDelegate::PerformedAction ItemSelected(
-      const ui::Event& event) override;
-  base::string16 GetTitle() override;
-  ShelfMenuModel* CreateApplicationMenu(int event_flags) override;
-  bool IsDraggable() override;
-  bool CanPin() const override;
-  bool ShouldShowTooltip() override;
-  void Close() override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AppListShelfItemDelegate);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_APP_LIST_SHELF_ITEM_DELEGATE_H_