Re: [fetch] "Let preflightResponse be the result of performi..." (#174)

If the preflight fetch doesn't return a network error, the information inside `preflightResponse` is never used anyways. After the last point a preflight fetch can return a network error (step 7 substep 6 or step 8), the only purpose is to update the `CORS-preflight cache`. Where does that cache come up again? `HTTP Fetch` doesn't refer to it directly. I get the feeling that doing the whole preflight fetch call is important for that cache, but it's hard to tell why it matters.

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https://github.com/whatwg/fetch/issues/174#issuecomment-164529860