Re: [fetch] Initializing context/content specific fetch defaults (#43)

I think Fetch could have a "SHOULD" value for various contexts to encourage user agents to converge. But it's important to define this since the point where the UA adds the `User-Agent` header is going to be observable. E.g. `Accept` we want to set before service workers, `Host` we want to set after (when we go to the network). If we ignore interoperability on the value, that timing alone is somewhat crucial.

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