[whatwg/fetch] Set request header's guard if no-cors (#1076)

Fixes #1074.

I think this is all it needs, because otherwise we want the header guard to be "request".
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1076

-- Commit Summary --

  * Set request header's guard if no-cors

-- File Changes --

    M fetch.bs (4)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1076.patch
https://github.com/whatwg/fetch/pull/1076.diff

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