[whatwg/url] Make URL's origin getter return null for file URLs (#506)

While we don't (want to) govern (yet) if one file URL can fetch another, we can at least govern that the origins file URLs hand out always serialize to "`null`".

That is, I would make the getter explicitly check if URL's scheme is "`file`" and if so, return "`null`". No need to go through all the trouble of defining a file URL origin I think as navigating to file URLs isn't defined.

This affects Safari and Chrome, neither of which return "`null`" yet for any non-special URLs as far as I can tell.

cc @achristensen07 @mikewest 

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