[whatwg/fetch] Remove unnecessary body transmission for service worker trapped requests (#678)

As the request is trapped by service worker, there is no need to transmit the body to network.

See #572 for more info.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/678

-- Commit Summary --

  * done?

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/678.patch
https://github.com/whatwg/fetch/pull/678.diff

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