message: fix(aio): fix PWA testing on Windows (and reduce flaky-ness)
  Adding a delay after Lighthouse has run and before killing the Chrome process
  avoids `ECONNREFUSED` errors on Windows and will hopefully prevent such errors
  occasionally appearing on CI.
  Based on info in:
diff: @@ -79,6 +79,9 @@ function launchChromeAndRunLighthouse(url, flags, config) {
  return launcher.run().
  then(() => lighthouse(url, flags, config)).
  + // Avoid race condition by adding a delay before killing Chrome.
  + // (See also https://github.com/paulirish/pwmetrics/issues/63#issuecomment-282721068.)
  + then(results => new Promise(resolve => setTimeout(() => resolve(results), 1000))).
  then(results => launcher.kill().then(() => results)).
  catch(err => launcher.kill().then(() => { throw err; }, () => { throw err; }));
  }
  