Re: [whatwg/fetch] Process subresource link headers (PR #1409)

I see, I raised this before in https://github.com/w3c/preload/issues/148 but that got closed by https://github.com/whatwg/html/pull/7622 which doesn't quite address this. (E.g., I think as defined a `Link` header on a style sheet creates different kind of fetches (with respect to `Referer` for instance) than subresources the style sheet might link.)

I'm rather concerned about a subresource fetch resulting in further fetches. That's simply not a side effect you'd expect when pulling a resource from elsewhere. @yoavweiss do you know where this feature got discussed before including the security implications, how this should relate to CSP, Referer headers, etc?

cc @domenic 

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