Rename the aura_shell namespace to ash

ash/wm/stacking_controller.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_STACKING_CONTROLLER_H_
 #define ASH_WM_STACKING_CONTROLLER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/stacking_client.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 class AlwaysOnTopController;
 
 class StackingController : public aura::client::StackingClient {
  public:
   StackingController();
   virtual ~StackingController();
 
   // Overridden from aura::client::StackingClient:
   virtual aura::Window* GetDefaultParent(aura::Window* window) OVERRIDE;
 
  private:
   // Returns corresponding modal container for a modal window.
   // If screen lock is not active, all modal windows are placed into the
   // normal modal container.
   // Otherwise those that originate from LockScreen container and above are
   // placed in the screen lock modal container.
   aura::Window* GetModalContainer(aura::Window* window) const;
 
   scoped_ptr<internal::AlwaysOnTopController> always_on_top_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(StackingController);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_WM_STACKING_CONTROLLER_H_