mash: Support ShelfModel access in Chrome.

ash/shelf/app_list_shelf_item_delegate.h

Index: ash/shelf/app_list_shelf_item_delegate.h
diff --git a/ash/shelf/app_list_shelf_item_delegate.h b/ash/shelf/app_list_shelf_item_delegate.h
index e0ca704b10f4aab470ee87296a1378f5d03c65ff..bb985cfbb2502fe48c1cf2cf5139aa36e08cd378 100644
--- a/ash/shelf/app_list_shelf_item_delegate.h
+++ b/ash/shelf/app_list_shelf_item_delegate.h
@@ -9,15 +9,10 @@
 #include "base/macros.h"
 
 namespace ash {
-class ShelfModel;
 
 // ShelfItemDelegate for TYPE_APP_LIST.
 class AppListShelfItemDelegate : public ShelfItemDelegate {
  public:
-  // Initializes the app list item in the shelf data model and creates an
-  // AppListShelfItemDelegate which will be owned by |model|.
-  static void CreateAppListItemAndDelegate(ShelfModel* model);
-
   AppListShelfItemDelegate();
   ~AppListShelfItemDelegate() override;