Re: [w3c/ServiceWorker] clarify when FetchEvent.clientId will or will not be set for navigations (#1267)

>From an implementation point of view I'm a little uneasy overloading `FetchEvent.clientId` to mean both:

* If a subresource requests, then this is the client that determines all permissions, CSP, referrer policy, etc.
* If a non-subresource requests, then this is the client that started it, but it doesn't set any policy on this request.

Its just a bit non-ideal to try to use the same information for policy in one case, but exempt it from that policy in others.  But maybe thats an implementation specific concern. 

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