CSSDeclarationImpl::GetNthProperty(PRUint32 aIndex, nsString& aReturn)
CSSDeclarationImpl::GetNthProperty(PRUint32 aIndex, nsAWritableString& aReturn)
CSSDeclarationImpl::GetNthProperty(PRUint32 aIndex, nsString& aReturn){  aReturn.SetLength(0);  if (nsnull != mOrder) {    nsCSSProperty property = (nsCSSProperty)(PRInt32)mOrder->ElementAt(aIndex);    if (0 <= property) {      aReturn.AppendWithConversion(nsCSSProps::GetStringValue(property));    }  }    return NS_OK;}