parent->FirstChild(aPresContext, nsnull, &result); return result;
return parent->GetFirstChild(nsnull);
GetNextSiblingAcrossLines(nsIPresContext *aPresContext, nsIFrame *aFrame){  aFrame = aFrame->GetLastInFlow();  nsIFrame *result = aFrame->GetNextSibling();  if (result)    return result;  nsIFrame *parent;  aFrame->GetParent()->GetNextInFlow(&parent);  if (!parent)    return nsnull;  parent->FirstChild(aPresContext, nsnull, &result);  return result;}