Re: [w3c/ServiceWorker] ServiceWorkerMessageEvent isn't consistent with MessageEvent (#989)

For mixins:

* I think I'd rather wait until IDL has actual mixins
* The other issue is what to do with the dictionary, since dictionaries don't support mixins, we'd have to duplicate there for now

Given that, I think we should postpone deduplication there, especially as it doesn't directly impact implementations or developers, but I'll raise an IDL issue on mixins for dictionaries.

For removing `ServiceWorkerMessageEvent`, I can make the change to HTML to make `MessageEvent` reusable for that case.

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