Rename the aura_shell namespace to ash

ash/app_list/app_list_item_group_view.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_VIEW_H_
 #define ASH_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ui/base/models/list_model_observer.h"
 #include "ui/views/view.h"
 
-namespace aura_shell {
+namespace ash {
 
 class AppListItemGroupModel;
 class AppListItemViewListener;
 
 // AppListItemGroupView displays its children tiles in a grid.
 class ASH_EXPORT AppListItemGroupView
     : public views::View,
       public ui::ListModelObserver {
  public:
   AppListItemGroupView(AppListItemGroupModel* model,
@@ skipping 29 matching lines @@
 
   // Tiles per row.
   int tiles_per_row_;
 
   // Index of focused tile view.
   int focused_index_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListItemGroupView);
 };
 
-}  // namespace aura_shell
+}  // namespace ash
 
 #endif  // ASH_APP_LIST_APP_LIST_ITEM_GROUP_VIEW_H_