Re: [slightlyoff/ServiceWorker] clarify behavior when fetch event handler throws (#896)

Right. We removed the monkey patch (that tried to detect exceptions) as you commented before. If we'd really want this, I think we might have to change event dispatch. That is, we'll need a new flag in an event like `exception thrown flag` and to set it in https://dom.spec.whatwg.org/#concept-event-listener-inner-invoke step 2.7 when the callback throws an exception. And SW just uses that flag later in the install steps.

But I slightly prefer we stay with the current event behavior for consistency, having clarified that any error occurring in async tasks will make the install fail.

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