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

ash/common/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_
+#ifndef ASH_COMMON_SHELF_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_
+#define ASH_COMMON_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 {
@@ skipping 13 matching lines @@
   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_
+#endif  // ASH_COMMON_SHELF_SHELF_WINDOW_WATCHER_ITEM_DELEGATE_H_