Re: [ServiceWorker] should installing workers be persisted if browser is killed? (#794)

Well, Chrome is even more different: `getRegistration()` itself returns null if there was never a successfully installed worker for that registration. In Chrome's design all persisted registrations have exactly one persisted worker (a waiting one or an active one).

I think that's cleaner, that way you don't need to keep around state for half-installed workers. It also applies to cases like a disk error while trying to write the worker.

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