Re: [ServiceWorker] unregister() in service worker navigation fetch event (#804)

We don't have a concept to reset the controller to null at the moment. I thought it was okay as a new client is created during a navigation. But I think it's not any more. It seems the behavior specified in HTML has been changed recently: https://html.spec.whatwg.org/#navigating-across-documents:set-up-a-browsing-context-environment-settings-object. Now an environment settings object is created only once per browsing context creation. This weakens the concept of a service worker client being an environment settings object. I think I have to dig into it.

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https://github.com/slightlyoff/ServiceWorker/issues/804#issuecomment-169546670