[w3c/ServiceWorker] Unregister a service worker when another tab is controlled by it can "resurrect" it (Chrome) (Issue #1687)

Repro steps:
- open 2 tabs controlled by the same service worker
- with the inspector opened, unregister the service worker (or do that in the console if u prefer)
- the service worker is now flagged as deleted
- if u just reload 1 of the tab, the reloaded tab will not be controlled, but the service worker is not flagged as deleted anymore
  - note that it's not like a new service worker is installed, the "id" displayed in the inspector is the same
  - this is why I say it's resurrected

This of course makes it hard to properly unregister a service worker unless u reload all the clients.  
This is what I'm doing, but I wonder if this bug can still happen if a client reload with a bit of delay, leading to the old service worker resurrection.

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