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

https://fetch.spec.whatwg.org/#http-fetch

> Let preflightResponse be the result of performing a CORS\-preflight fetch using request\.
> 
> If preflightResponse is a network error, return preflightResponse\. 

What is the purpose of `preflightResponse`? It is referenced nowhere after this step. Is it simply just used to check whether the result of `preflight-fetch` is a network error?

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https://github.com/whatwg/fetch/issues/174