Re: [ServiceWorker] Unable to easily distinguish top-level navigations (#673)

There might be contexts for which `isNavigation` can't be true, but this is additional information that's specific to this event (it doesn't really belong on `Request` because passing it along to `fetch()` is meaningless).

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https://github.com/slightlyoff/ServiceWorker/issues/673#issuecomment-90196331