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

Thanks @mfreed7, if you advise against supporting flip-flopping popovers, then I think we should leave `<dialog>` alone as well, unless we get some developer requests for flip-flopping. And for fullscreen, supporting flip-flopping is the simplest way to make the API consistent. (To disallow it, we'd need to add code to detect the situation and reject the fullscreen request in the async part of the algorithm.)

@tabatkins can you make the change to move the element to the top of top layer if it's already present?

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