[w3c/permissions] Don't assume collateral grant from getUserMedia. (#78)

[This text](https://w3c.github.io/permissions/#media-devices
): "A successful call to the getUserMedia function of [GETUSERMEDIA] MUST cause permission to be granted for the returned devices, and MAY cause other permissions to be granted."

Sounds like it mandates permission to change from `"prompt"` to `"granted"` after a call to `getUserMedia`? Chrome has such collateral grants, but Firefox doesn't, so this API would be returning the wrong value in Firefox (unless this is an attempt to mandate behavior on the mediacapture-main spec?)

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