[whatwg/xhr] Align with IDL dictionary changes (#250)

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

  https://github.com/whatwg/xhr/pull/250

-- Commit Summary --

  * Align with IDL dictionary changes

-- File Changes --

    M xhr.bs (2)

-- Patch Links --

https://github.com/whatwg/xhr/pull/250.patch
https://github.com/whatwg/xhr/pull/250.diff

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