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

ash/shell/context_menu.h

 // Copyright (c) 2012 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_SHELL_CONTEXT_MENU_H_
 #define ASH_SHELL_CONTEXT_MENU_H_
 
-#include "ash/shelf/shelf_alignment_menu.h"
+#include "ash/common/shelf/shelf_alignment_menu.h"
 #include "base/macros.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace ash {
 
 class WmShelf;
 
 namespace shell {
 
 // Context menu for the ash shell.
@@ skipping 19 matching lines @@
   WmShelf* wm_shelf_;
   ShelfAlignmentMenu alignment_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(ContextMenu);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_CONTEXT_MENU_H_