Rename the aura_shell namespace to ash

ash/app_list/app_list_item_group_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 ASH_APP_LIST_APP_LIST_ITEM_GROUP_MODEL_H_
 #define ASH_APP_LIST_APP_LIST_ITEM_GROUP_MODEL_H_
 #pragma once
 
 #include <string>
 
 #include "ash/app_list/app_list_item_model.h"
 #include "base/basictypes.h"
 #include "ash/ash_export.h"
 #include "ui/base/models/list_model.h"
 
-namespace aura_shell {
+namespace ash {
 
 // AppListItemGroupModel holds a list of AppListItemModels.
 class ASH_EXPORT AppListItemGroupModel {
  public:
   typedef ui::ListModel<AppListItemModel> Items;
 
   explicit AppListItemGroupModel(const std::string& title);
   virtual ~AppListItemGroupModel();
 
   void AddItem(AppListItemModel* item);
   AppListItemModel* GetItem(int index);
 
   const std::string& title() const {
     return title_;
   }
 
   int item_count() const {
     return items_.item_count();
   }
 
  private:
   const std::string title_;
   Items items_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListItemGroupModel);
 };
 
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_APP_LIST_APP_LIST_ITEM_GROUP_MODEL_H_