Re: [ServiceWorker] FetchEvent IDL issues (#680)

I'm changing Gecko's `FetchEvent.request` to be nullable since I think that is the only reasonable thing to do here given the fact that there is nothing to guarantee that request will be passed in when constructing a new fetch event.  Without this, `(new FetchEvent("foo")).request` is essentially specced to cause a crash (which it indeed does in Gecko right now.)  See https://bugzilla.mozilla.org/show_bug.cgi?id=1218499.  Please update the spec accordingly.  Thanks!

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