nsIFrame *result; aFrame->GetNextInFlow(&result);
nsIFrame *result = aFrame->GetNextInFlow();
GetNifOrSpecialSibling(nsFrameManager *aFrameManager, nsIFrame *aFrame){  nsIFrame *result;  aFrame->GetNextInFlow(&result);  if (result)    return result;  if (IsFrameSpecial(aFrame))    GetSpecialSibling(aFrameManager, aFrame, &result);  return result;}