static getFinalDisplayedUrl(lhr) {
    if (lhr.finalDisplayedUrl) return lhr.finalDisplayedUrl;
    if (lhr.finalUrl) return lhr.finalUrl;
    throw new Error('Could not determine final displayed URL');
  }
If LHR is older than 10.0 it will not have the `finalDisplayedUrl` property.
Old LHRs should have the `finalUrl` property which will work fine for the report.

@param {LH.Result} lhr