[whatwg/dom] Fix 515: Expose Event, EventTarget to AudioWorklet (#516)

@domenic @annevk PTAL.

- Fixes #515.
- The full context on this change can be found [here](https://github.com/WebAudio/web-audio-api/issues/1266).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/516

-- Commit Summary --

  * Expose Event, EventTarget to AudioWorklet

-- File Changes --

    M dom.bs (5)

-- Patch Links --

https://github.com/whatwg/dom/pull/516.patch
https://github.com/whatwg/dom/pull/516.diff

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