[whatwg/dom] Add [Exposed=Window] to MutationObserver (#507)

Helps with https://github.com/heycam/webidl/issues/365.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/507

-- Commit Summary --

  * Add [Exposed=Window] to MutationObserver

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/507.patch
https://github.com/whatwg/dom/pull/507.diff

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