[whatwg/fetch] Following signals. Fixes #668. (#670)

Handles cases where the signal's aborted flag is already set.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/670

-- Commit Summary --

  * Following signals. Fixes #668.

-- File Changes --

    M fetch.bs (23)

-- Patch Links --

https://github.com/whatwg/fetch/pull/670.patch
https://github.com/whatwg/fetch/pull/670.diff

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