mash: Move ShelfWindowWatcher[ItemDelegate] to ash/common.

ash/shelf/shelf_window_watcher_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_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_
-#define ASH_SHELF_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_
-
-#include "ash/common/shelf/shelf_item_delegate.h"
-#include "base/macros.h"
-
-namespace ash {
-
-class WmWindow;
-
-// ShelfItemDelegate for the items created by ShelfWindowWatcher.
-class ShelfWindowWatcherItemDelegate : public ShelfItemDelegate {
- public:
-  explicit ShelfWindowWatcherItemDelegate(WmWindow* window);
-  ~ShelfWindowWatcherItemDelegate() override;
-
- private:
-  // ShelfItemDelegate overrides:
-  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;
-
-  // The window associated with this item. Not owned.
-  WmWindow* window_;
-
-  DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcherItemDelegate);
-};
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_