Re: [whatwg/fetch] Cache-mode and upstream Cache-Control (#722)

Yes, I think the proposal is to remove what are now (17) and (18) from [http-network-or-cache-fetch](https://fetch.spec.whatwg.org/#http-network-or-cache-fetch):

> 17. If httpRequest’s [cache mode](https://fetch.spec.whatwg.org/#concept-request-cache-mode) is "no-cache", httpRequest’s [prevent no-cache cache-control header modification flag](https://fetch.spec.whatwg.org/#no-cache-prevent-cache-control) is unset, and httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list) [does not contain](https://fetch.spec.whatwg.org/#header-list-contains) `Cache-Control`, then [append](https://fetch.spec.whatwg.org/#concept-header-list-append) (`Cache-Control`, `max-age=0`) to httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list).
> 18. If httpRequest’s [cache mode](https://fetch.spec.whatwg.org/#concept-request-cache-mode) is "no-store" or "reload", then:
>    1) If httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list) [does not contain](https://fetch.spec.whatwg.org/#header-list-contains) `Pragma`, then [append](https://fetch.spec.whatwg.org/#concept-header-list-append) (`Pragma`, `no-cache`) to httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list).
>    2) If httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list) [does not contain](https://fetch.spec.whatwg.org/#header-list-contains) `Cache-Control`, then [append](https://fetch.spec.whatwg.org/#concept-header-list-append) (`Cache-Control`, `no-cache`) to httpRequest’s [header list](https://fetch.spec.whatwg.org/#concept-request-header-list).

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