[heycam/webidl] Define [[OwnPropertyKeys]] of legacy platform objects (#402)

Fixes #400.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/402

-- Commit Summary --

  * Define [[OwnPropertyKeys]] of legacy platform objects

-- File Changes --

    M index.bs (37)

-- Patch Links --

https://github.com/heycam/webidl/pull/402.patch
https://github.com/heycam/webidl/pull/402.diff

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