Eliminate ash::internal namespace

ash/system/chromeos/virtual_keyboard/virtual_keyboard_tray.cc

 // Copyright 2014 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/chromeos/virtual_keyboard/virtual_keyboard_tray.h"
 
 #include "ash/shell.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_utils.h"
 #include "grit/ash_resources.h"
 #include "grit/ash_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/event.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/keyboard/keyboard_controller.h"
 #include "ui/views/controls/button/image_button.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 class VirtualKeyboardButton : public views::ImageButton {
  public:
   VirtualKeyboardButton(views::ButtonListener* listener);
   virtual ~VirtualKeyboardButton();
 
   // Overridden from views::ImageButton:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
@@ skipping 75 matching lines @@
   DCHECK_EQ(button_, sender);
   PerformAction(event);
 }
 
 void VirtualKeyboardTray::OnAccessibilityModeChanged(
     AccessibilityNotificationVisibility notify) {
   SetVisible(Shell::GetInstance()->accessibility_delegate()->
       IsVirtualKeyboardEnabled());
 }
 
-}  // namespace internal
 }  // namespace ash