Re: [w3c/ServiceWorker] Should a service worker be allowed to register new service workers? (#1117)

I agree it would be prudent to restrict `register()` to contexts rooted by an open window.  So only permit it in worker contexts such that:

* a dedicated Worker created by a Window
* a dedicated Worker created by a parent Worker that is ultimately owned by a Window
* a SharedWorker with a Window attached

I think blocking `register()` in ServiceWorker would be reasonable for now.  We can always open it later if necessary.

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