[w3c/uievents] Add [Exposed=Window] to interface MutationEvent (#304)

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  https://github.com/w3c/uievents/pull/304

-- Commit Summary --

  * Add [Exposed=Window] to interface MutationEvent

-- File Changes --

    M sections/legacy-event-types.txt (1)

-- Patch Links --

https://github.com/w3c/uievents/pull/304.patch
https://github.com/w3c/uievents/pull/304.diff

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