Re: [w3c/ServiceWorker] Soft Update seems way to aggressive (#1250)

Service worker's update model is different from a store's in a few ways:

1. There may be dramatically more service workers installed on a device for sites visited once or infrequently compared to apps installed from a store.
2. Service worker therefore does not proactively update anything so we don't incur cost for all service workers installed.
3. Checking for updates on navigation is an opportunistic method of only incurring update cost for sites the user actually cares about.
4. Service worker updates are performed at times the device is in active use already and would be performing network operations if the SW wasn't there.

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