DOMMediaListImpl::GetLength(PRUint32* aLength)
CSSRuleListImpl::GetLength(PRUint32* aLength)
DOMMediaListImpl::GetLength(PRUint32* aLength){  NS_ENSURE_ARG_POINTER(aLength);  PRUint32 cnt;  nsresult rv = Count(&cnt);  if (NS_FAILED(rv)) return rv;  *aLength = cnt;  return NS_OK;}