Re: [w3c/ServiceWorker] Should 'Extend Service Worker Lifetime' be called after dispatching 'message' (#1050)

I believe in practice both chrome and firefox extend the lifetime for message events.

There needs to be some protection against using `self.registration.active.postMessage()` to self-post and stay alive forever.  Currently firefox does not have this problem because we don't expose ServiceWorker object on the worker context.  (Its a bug.)  I think chrome handles this case by only extending the lifetime of the SW if the calling SW has a controlled Client.

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