[whatwg/fetch] Use Web IDL's new record type (#412)

This is my first PR here, so please point out if I'm doing anything wrong.

Closes #164.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/412

-- Commit Summary --

  * Use Web IDL's new record type

-- File Changes --

    M fetch.bs (22)

-- Patch Links --

https://github.com/whatwg/fetch/pull/412.patch
https://github.com/whatwg/fetch/pull/412.diff

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