[whatwg/dom] Consider removing `document.origin` (#410)

We have `self.origin` in HTML, present inside workers and documents. It seems redundant and confusing to suggest that there's a different origin for documents than for the global object they host. Perhaps we can simply remove this in favor of the property on the global?

@bzbarsky seems to be on board with this notion. @cdumez, WDYT?

Edge hasn't implemented this yet, but perhaps @travisleithead has an opinion from a TAG/platformey perspective?

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