Rename the aura_shell namespace to ash

ash/shell_delegate.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_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 #pragma once
 
 #include "base/callback.h"
 #include "ash/ash_export.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace views {
 class Widget;
 }
 
-namespace aura_shell {
+namespace ash {
 
 class AppListModel;
 class AppListViewDelegate;
 struct LauncherItem;
 
 // Delegate of the Shell.
 class ASH_EXPORT ShellDelegate {
  public:
   // Callback to pass back a widget used by RequestAppListWidget.
   typedef base::Callback<void(views::Widget*)> SetWidgetCallback;
@@ skipping 24 matching lines @@
   virtual AppListViewDelegate* CreateAppListViewDelegate() = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
   virtual void LauncherItemClicked(const LauncherItem& item) = 0;
 
   // Invoked when a window is added. If the delegate wants the launcher to show
   // an entry for |item->window| it should configure |item| appropriately and
   // return true.
   virtual bool ConfigureLauncherItem(LauncherItem* item) = 0;
 };
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_