Eliminate ash::internal namespace

ash/shelf/shelf_button_host.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_BUTTON_HOST_H_
 #define ASH_SHELF_SHELF_BUTTON_HOST_H_
 
 #include "ash/ash_export.h"
 #include "base/strings/string16.h"
 
 namespace ui {
 class LocatedEvent;
 }
 
 namespace views {
 class View;
 }
 
 namespace ash {
-namespace internal {
 
 // The shelf buttons communicate back to the host by way of this interface.
 // This interface is used to enable reordering the items on the shelf.
 class ASH_EXPORT ShelfButtonHost {
  public:
   enum Pointer {
     NONE,
     DRAG_AND_DROP,
     MOUSE,
     TOUCH,
@@ skipping 23 matching lines @@
   // Invoked when the mouse exits the item.
   virtual void MouseExitedButton(views::View* view) = 0;
 
   // Invoked to get the accessible name of the item.
   virtual base::string16 GetAccessibleName(const views::View* view) = 0;
 
  protected:
   virtual ~ShelfButtonHost() {}
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_BUTTON_HOST_H_