Re: [ServiceWorker] pending fetch events may be dispatched to exiting worker (#785)

Chrome behavior is a bit wrong here: it immediately terminates an exiting worker instead of waiting for it to finish processing events. If we do get in a situation where we dispatch a fetch event and then immediately the next worker calls skipWaiting(), it looks like we'd forcibly kill the worker in the middle of onfetch().

We have a TODO to actually wait.

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