Rename the aura_shell namespace to ash

ash/wm/shadow.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_SHADOW_H_
 #define ASH_WM_SHADOW_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ash/ash_export.h"
 #include "ui/gfx/rect.h"
 
 namespace ui {
 class Layer;
 }  // namespace ui
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 class ImageGrid;
 
 // Simple class that draws a drop shadow around content at given bounds.
 class ASH_EXPORT Shadow {
  public:
   Shadow();
   ~Shadow();
 
@@ skipping 13 matching lines @@
  private:
   scoped_ptr<ImageGrid> image_grid_;
 
   // Bounds of the content that the shadow encloses.
   gfx::Rect content_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(Shadow);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_WM_SHADOW_H_