mash: Move shelf model and item classes to ash/common/shelf

ash/shelf/app_list_shelf_item_delegate.cc

 // Copyright 2013 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/shelf/app_list_shelf_item_delegate.h"
 
-#include "ash/shelf/shelf_model.h"
+#include "ash/common/shelf/shelf_model.h"
 #include "ash/shell.h"
 #include "grit/ash_strings.h"
 #include "ui/app_list/app_list_switches.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace ash {
 
 AppListShelfItemDelegate::AppListShelfItemDelegate() {
   ShelfItem app_list;
   app_list.type = TYPE_APP_LIST;
@@ skipping 42 matching lines @@
 }
 
 bool AppListShelfItemDelegate::ShouldShowTooltip() {
   return true;
 }
 
 void AppListShelfItemDelegate::Close() {
 }
 
 }  // namespace ash