Re: [slightlyoff/ServiceWorker] Never fail for navigation requests (#892)

> 1.    An error is thrown in the fetch listener and respondWith is not called (at the moment, I think the request will proceed to network)
> 2.    An error is thrown in the fetch listener and respondWith is called (at the moment, this depends on the value passed to respondWith)
> 3.    The resolved value passed to respondWith is not a response (at the moment, network error)
> 4.    The promise passed to respondWith rejects (at the moment, network error)

I would fail on 3 and 4 and perhaps retry bypassing the worker on 1 and 2. From the programmable proxy perspective of the service worker, if that piece does not work, let the request continue to the network although if I'm explicitly passing a wrong type to the `respondWith`, let it fail. In any case, on failure, call `onerror()` for the `ServiceWorkerGlobalScope`.

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