[whatwg/xhr] Align with Fetch's forbidden request-header refactor (PR #362)

Fetch PR: https://github.com/whatwg/fetch/pull/1541.

(Skipped the template as that's covered by Fetch.)
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/xhr/pull/362

-- Commit Summary --

  * Align with Fetch's forbidden request-header refactor

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/362.patch
https://github.com/whatwg/xhr/pull/362.diff

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