Re: [slightlyoff/ServiceWorker] spec behavior when ServiceWorkerContainer parent client is dead (#777)

F2F:

* Seems like browsers keep windows alive when there's a reference held within
* This is a much bigger web compat problem, and needs to be solved at a lower level
* Do we do fetches from a detached iframe? We don't SW control these, and should spec that
* Are detached iframes controlled? 
* If you add/remove iframe
* This is another good argument for the `clientcontrolled` event
* Happy for methods to fail (throw/reject) if the window is detated, properties shouldn't throw, but may return undefined/null

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