[w3c/ServiceWorker] NavigationPreloadManager.setHeaderValue should reject invalid HTTP header field values (#1000)

(Spinning off of the long thread at #920) 
The WIP Blink implementation requires the string to be latin1-only and contain no `\r`, `\n`, or `\0`, rejecting with a TypeError if not.

This should be specced. Probably we'd point to the Fetch spec's definition, which is being worked on at https://github.com/whatwg/fetch/issues/332.

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