Rename the aura_shell namespace to ash

ash/app_list/app_list_item_model.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 UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_H_
 #define UI_AURA_SHELL_APP_LIST_APP_LIST_ITEM_MODEL_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ash/ash_export.h"
 
-namespace aura_shell {
+namespace ash {
 
 class AppListItemModelObserver;
 
 // AppListItemModel provides icon and title to be shown in a TileView and
 // action to be executed when the TileView is activated (clicked or enter
 // key it hit).
 class ASH_EXPORT AppListItemModel {
  public:
   AppListItemModel();
   virtual ~AppListItemModel();
@@ skipping 15 matching lines @@
 
  private:
   SkBitmap icon_;
   std::string title_;
 
   ObserverList<AppListItemModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListItemModel);
 };
 
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // #define ASH_APP_LIST_APP_LIST_ITEM_MODEL_OBSERVER_H_