[whatwg/fetch] Fail request when streaming request body is used in ServiceWorker (#1144)

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Fixes w3c/ServiceWorker#1560

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/1144

-- Commit Summary --

  * Fail request when streaming request body is used in ServiceWorker

-- File Changes --

    M fetch.bs (8)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1144.patch
https://github.com/whatwg/fetch/pull/1144.diff

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