Eliminate ash::internal namespace

ash/wm/system_modal_container_layout_manager.h

 // Copyright (c) 2012 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_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 #define ASH_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window_observer.h"
 
 namespace aura {
 class Window;
 class EventFilter;
 }
 namespace gfx {
 class Rect;
 }
 namespace views {
 class Widget;
 }
 
 namespace ash {
-namespace internal {
 
 // LayoutManager for the modal window container.
 class ASH_EXPORT SystemModalContainerLayoutManager
     : public aura::LayoutManager,
       public aura::WindowObserver {
  public:
   explicit SystemModalContainerLayoutManager(aura::Window* container);
   virtual ~SystemModalContainerLayoutManager();
 
   bool has_modal_background() const { return modal_background_ != NULL; }
@@ skipping 45 matching lines @@
   // A widget that dims the windows behind the modal window(s) being
   // shown in |container_|.
   views::Widget* modal_background_;
 
   // A stack of modal windows. Only the topmost can receive events.
   std::vector<aura::Window*> modal_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemModalContainerLayoutManager);
 };
 
-}  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_SYSTEM_MODAL_CONTAINER_LAYOUT_MANAGER_H_