return nsnull;
nsTransferableFactory::FindParentLinkNode(nsIDOMNode* inNode){  nsCOMPtr<nsIContent> content(do_QueryInterface(inNode));  if (!content) {    // That must have been the document node; nothing else to do here;    return nsnull;  }  for ( ; content; content = content->GetParent()) {    if (nsContentUtils::IsDraggableLink(content)) {      nsIDOMNode* node = nsnull;      CallQueryInterface(content, &node);      return node;    }  }}