Re: [whatwg/fullscreen] Remove top layer definitions, now that CSS Position 4 contains them. (PR #223)

For testing, a think a single new test would cover this PR. It should have two sibling divs, A and B. Request fullscreen once per click in order A-B-A and assert that all requests succeed but the last is a no-op and that `document.fullscreenElement` is still B. Bonus points for exiting fullscreen once and asserting that `document.fullscreenElement` is then A again, and then once more to make `document.fullscreenElement` null.

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