Re: [slightlyoff/ServiceWorker] should ServiceWorkerContainer.getRegistrations() check the uninstalling flag (#943)

> I'm not sure I understand the use case of exposing an uninstalling flag via self.registration.uninstalling.

I haven't come across any use case yet. I guess @wanderview might have thought it would help in case we need some way to prevent further operations on a registration when it's being uninstalled. However, I don't see any issue with the current behavior: when called on an uninstalling registration, `registration.update()` rejects, and `registration.unregister()` resolves with true if it's still waiting to be cleared or resolves with false if it's already cleared, which seem reasonable to me.

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