[w3c/ServiceWorker] Clarification on what happens during a terminated activation (#1372)

Hi!

Across browsers, we are seeing different behaviors for a terminated activation.

For Chrome:
If a worker is terminated during activation, it is placed back into the 'activating' state on next browser load.  The activation handlers are re-run.

For FireFox:
If a worker is terminated during activation, the worker is discarded, and re-installation is required.

For Microsoft Edge:
If a worker is terminated during activation, the worker (on next browser load) is placed into the 'activated' state.  The activation handlers are not re-run.

>From the spec:
https://w3c.github.io/ServiceWorker/#activation-algorithm

> Note: Once an active worker is activating, neither a runtime script error nor a *force termination of the active worker prevents the active worker from getting activated*.

Chrome's behavior seems to be what I'd expect as a developer, but I don't think that it's well-reflected in the spec.

Thoughts?

Thanks!

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