[whatwg/dom] Align with IDL dictionary changes (#771)

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

  https://github.com/whatwg/dom/pull/771

-- Commit Summary --

  * Align with IDL dictionary changes

-- File Changes --

    M dom.bs (18)

-- Patch Links --

https://github.com/whatwg/dom/pull/771.patch
https://github.com/whatwg/dom/pull/771.diff

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