Re: [ServiceWorker] ServiceWorkerClient to Client (#588)

Just had a chat with @mounirlamouri. To clarify, `.focus` and `.openWindow` should reject if they fail to complete, which would happen in cases such as:

* Window has already closed, so cannot focus
* Browser does not grant permission

When it comes to permission, it'll probably be a MAY in the spec. As in "If the call is not within the context of an interaction event, the browser MAY reject"

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