[w3c/permissions] Use HTML's new "allowed to use" algorithm (#121)

It was introduced with https://github.com/whatwg/html/pull/1492 and would replace the bit about the `allowusermedia` attribute in https://w3c.github.io/permissions/#media-devices

See https://github.com/whatwg/fullscreen/issues/41 for example wording, once there's a PR.

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https://github.com/w3c/permissions/issues/121