Rename the aura_shell namespace to ash

ash/shell/example_factory.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_SHELL_EXAMPLE_FACTORY_H_
 #define ASH_SHELL_EXAMPLE_FACTORY_H_
 #pragma once
 
 #include "ash/shell_delegate.h"
 
-namespace aura_shell {
+namespace ash {
 class AppListModel;
 class AppListViewDelegate;
 }
 
 namespace views {
 class View;
 }
 
 namespace ash {
 namespace shell {
 
 void CreatePointyBubble(views::View* anchor_view);
 
 void CreateLockScreen();
 
 // Creates a window showing samples of commonly used widgets.
 void CreateWidgetsWindow();
 
-void BuildAppListModel(aura_shell::AppListModel* model);
+void BuildAppListModel(ash::AppListModel* model);
 
-aura_shell::AppListViewDelegate* CreateAppListViewDelegate();
+ash::AppListViewDelegate* CreateAppListViewDelegate();
 
 void CreateAppList(
     const gfx::Rect& bounds,
-    const aura_shell::ShellDelegate::SetWidgetCallback& callback);
+    const ash::ShellDelegate::SetWidgetCallback& callback);
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_EXAMPLE_FACTORY_H_