Rename the aura_shell namespace to ash

ash/wm/root_window_layout_manager.h

 // Copyright (c) 2011 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_ROOT_WINDOW_LAYOUT_MANAGER_H_
 #define ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/layout_manager.h"
 
 namespace aura {
 class Window;
 }
 namespace gfx {
 class Rect;
 }
 namespace views {
 class Widget;
 }
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 // A layout manager for the root window.
 // Resizes all of its immediate children to fill the bounds of the root window.
 class RootWindowLayoutManager : public aura::LayoutManager {
  public:
   explicit RootWindowLayoutManager(aura::Window* owner);
   virtual ~RootWindowLayoutManager();
 
   void set_background_widget(views::Widget* background_widget) {
@@ skipping 12 matching lines @@
  private:
   aura::Window* owner_;
 
   // May be NULL if we're not painting a background.
   views::Widget* background_widget_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowLayoutManager);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_WM_ROOT_WINDOW_LAYOUT_MANAGER_H_