mash: Move shelf model and item classes to ash/common/shelf

ash/common/shelf/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_SHELF_ITEM_DELEGATE_H_
-#define ASH_SHELF_SHELF_ITEM_DELEGATE_H_
+#ifndef ASH_COMMON_SHELF_SHELF_ITEM_DELEGATE_H_
+#define ASH_COMMON_SHELF_SHELF_ITEM_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "base/strings/string16.h"
 
 namespace ui {
 class Event;
 class MenuModel;
 }
 
 namespace ash {
@@ skipping 53 matching lines @@
   // Returns true if a tooltip should be shown.
   virtual bool ShouldShowTooltip() = 0;
 
   // Closes all windows associated with this item.
   virtual void Close() = 0;
 
 };
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_ITEM_DELEGATE_H_
+#endif  // ASH_COMMON_SHELF_SHELF_ITEM_DELEGATE_H_