chromium/chrome/test/data/sync/encryption_keys_retrieval.html

<html>
<head>
<script>
window.onload = function() {
  setTimeout(function() {
    // A second page is loaded during retrieval, such that Blink sees a
    // non-empty navigation history when determining whether closing the tab via
    // Javascript is allowed.
    this.document.location.href =
        "/sync/encryption_keys_retrieval_complete.html" +
        location.search;
  }, 0);
}
</script>
</head>
</html>