nsresult rv = imageFrame->GetNaturalImageSize(&width, &height);
rv = imageFrame->GetNaturalImageSize(&width, &height);
nsHTMLImageElement::GetNaturalWidth(PRInt32* aNaturalWidth){  NS_ENSURE_ARG_POINTER(aNaturalWidth);  *aNaturalWidth = 0;  nsIImageFrame* imageFrame;  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;  *aNaturalWidth = (PRInt32)width;  return NS_OK;}