[whatwg/fullscreen] Drop the iframe ancestor check? (#45)

This was last changed in 0257af72893471c98f2c006777c8aa59ab668818 and seems to have originated in e6fa2d688e713d371eeaf80c6266179230d06f69.

After 0b7c994bfcedb291cb9ab7398b26cb4a575470d1 and 766dc872bcf26c012549f7bdfde21c46bebba40c there are no other hierarchy restrictions, and there's probably no reason to keep the iframe ancestor check. By itself, it doesn't seem to provide any interesting guarantees.

Motivation: Removing this *may* make it easier to propagate the result of the fullscreen element ready check to other processes, currently being discussed in https://bugs.chromium.org/p/chromium/issues/detail?id=402376#c13

@upsuper

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