Eliminate ash::internal namespace

ash/system/tray/tray_popup_label_button_border.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_SYSTEM_TRAY_TRAY_POPUP_LABEL_BUTTON_BORDER_H_
 #define ASH_SYSTEM_TRAY_TRAY_POPUP_LABEL_BUTTON_BORDER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/controls/button/label_button_border.h"
 
 namespace ash {
-namespace internal {
 
 // A border for label buttons that paints a vertical separator in normal state
 // and a custom hover effect in hovered or pressed state.
 class TrayPopupLabelButtonBorder : public views::LabelButtonBorder {
  public:
   TrayPopupLabelButtonBorder();
   virtual ~TrayPopupLabelButtonBorder();
 
   // views::LabelButtonBorder:
   virtual void Paint(const views::View& view, gfx::Canvas* canvas) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TrayPopupLabelButtonBorder);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_POPUP_LABEL_BUTTON_BORDER_H_