Eliminate ash::internal namespace

ash/first_run/desktop_cleaner.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/first_run/desktop_cleaner.h"
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_observer.h"
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification_blocker.h"
 
 namespace ash {
-namespace internal {
-
 namespace {
 
 const int kContainerIdsToHide[] = {
   kShellWindowId_DefaultContainer,
   kShellWindowId_AlwaysOnTopContainer,
   kShellWindowId_PanelContainer,
   // TODO(dzhioev): uncomment this when issue with BrowserView::CanActivate
   // will be fixed.
   // kShellWindowId_SystemModalContainer
 };
@@ skipping 78 matching lines @@
 }
 
 DesktopCleaner::~DesktopCleaner() {}
 
 // static
 std::vector<int> DesktopCleaner::GetContainersToHideForTest() {
   return std::vector<int>(kContainerIdsToHide,
                           kContainerIdsToHide + arraysize(kContainerIdsToHide));
 }
 
-}  // namespace internal
 }  // namespace ash