Re: [w3c/permissions] "prompt the user to choose" algorithm impedance mismatch. (#161)

I *think* you'll call [prompt the user to choose](https://w3c.github.io/permissions/#prompt-the-user-to-choose) with a descriptor that has no `deviceId`, with a list of options consisting of all the cameras or microphones matching the `MediaStreamConstraints`. 

That's not totally satisfying, since no current browser actually gives the user a choice of which camera to grant access to, but prompt-to-choose doesn't have a way to return several or all of the options.

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