Rename the aura_shell namespace to ash

ash/launcher/app_launcher_button.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_LAUNCHER_APP_LAUNCHER_BUTTON_H_
 #define ASH_LAUNCHER_APP_LAUNCHER_BUTTON_H_
 #pragma once
 
 #include "ui/views/controls/button/image_button.h"
 
-namespace aura_shell {
+namespace ash {
 namespace internal {
 
 class LauncherButtonHost;
 
 // Button used for items on the launcher corresponding to an app window.
 class AppLauncherButton : public views::ImageButton {
  public:
   AppLauncherButton(views::ButtonListener* listener,
                     LauncherButtonHost* host);
   virtual ~AppLauncherButton();
 
   // Sets the image to display for this entry.
   void SetAppImage(const SkBitmap& image);
 
  protected:
   // View overrides:
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
 
  private:
   LauncherButtonHost* host_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLauncherButton);
 };
 
 }  // namespace internal
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_LAUNCHER_APP_LAUNCHER_BUTTON_H_