[ServiceWorker] ServiceWorkerMessageEvent.origin spec text is confusing (#859)

The ServiceWorkerMessageEvent.origin attribute is currently spec'd as:

> The origin attribute must return the value it was initialized to. When the object is created, this attribute must be initialized to the empty string. It represents the origin of the service worker’s environment settings object from which the message is sent.

Which is it, the empty string or the actual origin of the environment settings object?

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