[w3c/push-api] event.waitUntil(registration.subscribe()) would cause a deadlock (#221)

The steps for `subscribe` wait for the installing or waiting version to become active before resolving the promise. This seems to mean
`oninstall = e => { e.waitUntil(self.registration.subscribe()); }`
would cause a deadlock (though the UA may timeout the event and fail the installation). Maybe subscribe() should reject if called without an active worker? I believe Chrome's current implementation does this.

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