Make sure the rootNode of a LiveNodeListBase is always a ContainerNode

Source/core/html/HTMLTableRowsCollection.h

 /*
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 20 matching lines @@
 
 #include "core/html/HTMLCollection.h"
 
 namespace WebCore {
 
 class HTMLTableElement;
 class HTMLTableRowElement;
 
 class HTMLTableRowsCollection FINAL : public HTMLCollection {
 public:
-    static PassRefPtr<HTMLTableRowsCollection> create(Node*, CollectionType);
+    static PassRefPtr<HTMLTableRowsCollection> create(ContainerNode*, CollectionType);
 
     static HTMLTableRowElement* rowAfter(HTMLTableElement*, HTMLTableRowElement*);
     static HTMLTableRowElement* lastRow(HTMLTableElement*);
 
 private:
-    explicit HTMLTableRowsCollection(Node*);
+    explicit HTMLTableRowsCollection(ContainerNode*);
 
     virtual Element* virtualItemAfter(Element*) const OVERRIDE;
 };
 
 } // namespace
 
 #endif