message: fix(aio): googlebot polyfill fix
diff: <!-- End Google Analytics -->
  <script>
  - /**
  - * Send a blocking request to fetch polyfill. We call this only on non-evergreen browsers.
  - */
  - function polyfillBrowser(polyfillUrl) {
  - var script = document.createElement('script');
  - script.src = polyfillUrl;
  - document.head.appendChild(script);
  - }
  if (window.document.documentMode) {
  - // polyfill IE11
  - polyfillBrowser('generated/ie-polyfills.min.js');
  + // polyfill IE11 in a blocking way
  + var s = document.createElement('script');
  + s.src = 'generated/ie-polyfills.min.js';
  + document.head.appendChild(s);
  } else if (!Object.assign) {
  - // polyfill googlebot
  - polyfillBrowser('https://cdn.polyfill.io/v2/polyfill.min.js?unknown=polyfill');
  + // polyfill other non-evergreen browsers in a blocking way
  + var polyfillUrl = "https://cdn.polyfill.io/v2/polyfill.min.js?features=default,Array.prototype.find&flags=gated&unknown=polyfill";
  +
  + // send a blocking XHR to fetch the polyfill
  + // then append it to the document so that its eval-ed synchronously
  + // this is required because the method used for IE is not reliable with other non-evergreen browsers
  + var xhr = new XMLHttpRequest();
  + xhr.addEventListener("load", function() {
  + var s = document.createElement('script');
  + s.type = 'text/javascript';
  + var code = this.responseText;
  + s.appendChild(document.createTextNode(code));
  + document.head.appendChild(s);
  + });
  + xhr.open("GET", polyfillUrl, false);
  + xhr.send();
  }
  </script>
  </head>
  