Re: [w3c/permissions] Exceptions in promise using algorithms (#102)

Users don't call the [permission request algorithm](https://w3c.github.io/permissions/#permission-request-algorithm) directly; it's only used by [`request()`](https://w3c.github.io/permissions/#dom-permissions-request), which correctly translates the exception into a project rejection. So, I think it's correct, but maybe should be made more clear somehow?

We generally reject promises with things like [`SecurityError`](https://heycam.github.io/webidl/#securityerror), which are `DOMException`s instead of `Error`s.

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