nsresult rv = imageFrame->GetNaturalImageSize(&width, &height);
rv = imageFrame->GetNaturalImageSize(&width, &height);
nsHTMLImageElement::GetNaturalHeight(PRInt32* aNaturalHeight){  NS_ENSURE_ARG_POINTER(aNaturalHeight);  *aNaturalHeight = 0;  nsIImageFrame* imageFrame = nsnull;  GetImageFrame(&imageFrame);  if (!imageFrame)    return NS_OK; // don't throw JS exceptions in this case  PRUint32 width, height;  nsresult rv = imageFrame->GetNaturalImageSize(&width, &height);  if (NS_FAILED(rv))    return NS_OK;  *aNaturalHeight = (PRInt32)height;  return NS_OK;}