Eliminate ash::internal namespace

ash/system/tray/tray_popup_header_button.cc

 // 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.
 
 #include "ash/system/tray/tray_popup_header_button.h"
 
 #include "ash/ash_constants.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/painter.h"
 
 namespace ash {
-namespace internal {
 
 // static
 const char TrayPopupHeaderButton::kViewClassName[] =
     "tray/TrayPopupHeaderButton";
 
 TrayPopupHeaderButton::TrayPopupHeaderButton(views::ButtonListener* listener,
                                              int enabled_resource_id,
                                              int disabled_resource_id,
                                              int enabled_resource_id_hover,
                                              int disabled_resource_id_hover,
@@ skipping 34 matching lines @@
   const int kBorderHeight = 25;
   int padding = (height() - kBorderHeight) / 2;
   canvas->FillRect(gfx::Rect(0, padding, 1, height() - padding * 2),
       ash::kBorderDarkColor);
 }
 
 void TrayPopupHeaderButton::StateChanged() {
   SchedulePaint();
 }
 
-}  // namespace internal
 }  // namespace ash