chromeos: Move files in //ash/common to //ash

ash/shelf/overflow_button.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_COMMON_SHELF_OVERFLOW_BUTTON_H_
-#define ASH_COMMON_SHELF_OVERFLOW_BUTTON_H_
+#ifndef ASH_SHELF_OVERFLOW_BUTTON_H_
+#define ASH_SHELF_OVERFLOW_BUTTON_H_
 
 #include "base/macros.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
 
 namespace ash {
 class ShelfView;
 class WmShelf;
 
@@ skipping 40 matching lines @@
   WmShelf* wm_shelf_;
 
   // Color used to paint the background.
   SkColor background_color_;
 
   DISALLOW_COPY_AND_ASSIGN(OverflowButton);
 };
 
 }  // namespace ash
 
-#endif  // ASH_COMMON_SHELF_OVERFLOW_BUTTON_H_
+#endif  // ASH_SHELF_OVERFLOW_BUTTON_H_