Re: [slightlyoff/ServiceWorker] More clarity around waiting for an active worker to finish (#916)

> If the browser's need for a request is dropped (page closes or user hits X on a navigation), then the respondWith promise for the related fetch no longer counts. However, I'm inclined to continue counting fetchEvent.waitUntil, since those actions may still be useful.

Yea, I agree we should handle FetchEvent just like other events.  Even when the last controlled page closes we will still have to handle push/bg-sync events that are queued up.  Seems safest to just flush fetch events naturally.

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