Re: [fetch] fetch() needs to send a */* header (#142)

Yes, one could argue that.  But you can also argue that given that we have taken away XHR from `ServiceWorkerGlobalScope`, there is no easy way to get the old behavior back, so if you're dealing with a server that breaks because of missing `Accept` headers you are going to have the joy of debugging what the cause is.  That seems terrible to me if we want this to be friendly to web developers.

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