[w3c/ServiceWorker] ephemeral fingerprinting (#1561)

At first glance, I'm not clear on whether events can be fired based only on context-dependent timers or also based on external things.  If the latter, then presumable service workers could be a vector for ephemeral fingerprinting.  Even if there's not an issue, this should be written up in the privacy considerations section, providing justification for why it's not an issue.

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