Re: [w3c/push-api] push-register (pushregistrationlost / pushsubscriptionchange) behavior when clearing browser cache (#61)

We have this covered in the `Security and privacy considerations` section.

> When a service worker registration is unregistered, any associated push subscription must be deactivated.

Clearing data deletes the Service Worker registration, which deactivates the push subscription, which (eventually) tells the push service, that then can tell the application server.


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