Re: [w3c/ServiceWorker] consider using navigation preload response when respondWith() is not called (Issue #1611)

The request is sent with a `Service-Worker-Navigation-Preload` header, which can be assigned a custom value. The idea here is that the server could return something other than a regular response. Eg, just the main content to be inserted in some other shell, or a JSON response to be fed into app code.

Auto-responding with this could produce broken output.

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