Update api.Animation.pending as shipped in Chromium 76 (#12536)
Update api.Animation.pending as shipped in Chromium 76 (#12536)

Chrome 76 is from mdn-bcd-collector results:
http://mdn-bcd-collector.appspot.com/tests/api/Animation/pending

The rest is mirrored, with the assumption that this wasn't in Edge 18.

Also fix the incorrect spec URL.
chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data