[whatwg/fetch] Make HTTP fetch rejecting a streaming upload request on 421. (#1141)

Following https://github.com/whatwg/fetch/issues/982.
I'll send web-platform-tests pull-request.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1141

-- Commit Summary --

  * init

-- File Changes --

    M fetch.bs (5)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1141.patch
https://github.com/whatwg/fetch/pull/1141.diff

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https://github.com/whatwg/fetch/pull/1141