[whatwg/fetch] Fetch metadata (#1087)

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

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

  https://github.com/whatwg/fetch/pull/1087


-- Commit Summary --

  * Integrate with Fetch Metadata.
  * Merge remote-tracking branch 'origin/master' into fetch-metadata
  * fixup bikeshedding

-- File Changes --

    M fetch.bs (8)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1087.patch

https://github.com/whatwg/fetch/pull/1087.diff


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