Rename the aura_shell namespace to ash

ash/app_list/app_list_item_group_view.cc

 // 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.
 
 #include "ash/app_list/app_list_item_group_view.h"
 
 #include "ash/app_list/app_list_item_group_model.h"
 #include "ash/app_list/app_list_item_view.h"
 #include "ui/views/layout/grid_layout.h"
 
-namespace aura_shell {
+namespace ash {
 
 AppListItemGroupView::AppListItemGroupView(AppListItemGroupModel* model,
                                            AppListItemViewListener* listener)
     : model_(model),
       listener_(listener),
       tiles_per_row_(0),
       focused_index_(0) {
   Update();
 }
 
@@ skipping 83 matching lines @@
 }
 
 void AppListItemGroupView::ListItemsRemoved(int start, int count) {
   Update();
 }
 
 void AppListItemGroupView::ListItemsChanged(int start, int count) {
   NOTREACHED();
 }
 
-}  // namespace aura_shell
+}  // namespace ash