Re: [w3c/ServiceWorker] postMessage keeps service workers alive indefinitely (#980)

"Keeping the worker alive" is a browser implementation detail, no?  The whole grace timer mechanism just falls into the spec's "browser can kill the worker whenever it wants" language.

In FF we currently avoid this by conveniently not setting self.registration.active, etc.  So its impossible to self `postMessage()` right now.  When we implement that, though, I was planning to just inspect the source of the message event.  If it was the same worker that was being posted to, then we would not increment the keep-alive reference count.

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