[whatwg/fetch] Align with IDL dictionary changes (#919)

See https://github.com/heycam/webidl/pull/750.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/919

-- Commit Summary --

  * Align with IDL dictionary changes

-- File Changes --

    M fetch.bs (4)

-- Patch Links --

https://github.com/whatwg/fetch/pull/919.patch
https://github.com/whatwg/fetch/pull/919.diff

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