[whatwg/fetch] Don't append controls for upstream caches. (#788)

The developer may want to control the local cache separately from those
upstream; if they want to control both, they can append their own
request headers.

Fixes #722.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/788

-- Commit Summary --

  * Don't append controls for upstream caches.

-- File Changes --

    M fetch.bs (23)

-- Patch Links --

https://github.com/whatwg/fetch/pull/788.patch
https://github.com/whatwg/fetch/pull/788.diff

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