mash: Move shelf menu code to //ash/common/shelf

ash/common/shelf/shelf_menu_model.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_MENU_MODEL_H_
-#define ASH_SHELF_SHELF_MENU_MODEL_H_
+#ifndef ASH_COMMON_SHELF_SHELF_MENU_MODEL_H_
+#define ASH_COMMON_SHELF_SHELF_MENU_MODEL_H_
 
 #include "ash/ash_export.h"
 #include "base/macros.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace ash {
 
 // A special menu model which keeps track of an "active" menu item.
 class ASH_EXPORT ShelfMenuModel : public ui::SimpleMenuModel {
  public:
   explicit ShelfMenuModel(ui::SimpleMenuModel::Delegate* delegate)
       : ui::SimpleMenuModel(delegate) {}
 
   // Returns |true| when the given |command_id| is active and needs to be drawn
   // in a special state.
   virtual bool IsCommandActive(int command_id) const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShelfMenuModel);
 };
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_MENU_MODEL_H_
+#endif  // ASH_COMMON_SHELF_SHELF_MENU_MODEL_H_