[w3c/ServiceWorker] Service worker MessageEvents set the "origin" property, but Worker MessageEvents do not. (#1122)

Compare https://html.spec.whatwg.org/#dom-messageport-postmessage and https://w3c.github.io/ServiceWorker/#dom-serviceworker-postmessage . `source` is special in service workers, fine, but I'm confused as to why the inconsistency in `origin`.

I think the best fix might be to set `origin` for workers too, but I am not sure.

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https://github.com/w3c/ServiceWorker/issues/1122