Remove ghost feature: api.HTMLAnchorElement.media

[queengooborg]

A number of my recent PRs have been setting api.HTMLAnchorElement.media to false. It has been determined that this feature is actually a ghost feature, with no implementation or spec. This feature should be removed from BCD.

---

So I realize this patch is scoped to just updating the Safari data — but as far as I can see, all the data we have for this feature is wrong. There’s no HTMLAnchorElement.prototype.media in Blink or Gecko either — which is unsurprising since https://html.spec.whatwg.org/multipage/text-level-semantics.html#htmlanchorelement doesn’t actually define a media member for HTMLAnchorElement, not even as an obsolete member in https://html.spec.whatwg.org/multipage/obsolete.html#HTMLAnchorElement-partial. And there is actually no https://developer.mozilla.org/docs/Web/API/HTMLAnchorElement/media article.

So it seems to me we should just remove this entire feature.

Originally posted by @sideshowbarker in #7402 (comment)

[queengooborg]

Resolved by #7538.