[whatwg/dom] .createElement's namespace handling doesn't seem to match what UAs do (#264)

https://github.com/whatwg/dom/pull/213 made it rely only on contentType but that isn't what UAs
(Gecko, Blink, Edge at least) do. http://mozilla.pettay.fi/moztests/imagedoc.html
Perhaps contentType should be used only in case Document is non-HTMLDocument.
ImageDocument inherits HTMLDocument, so it is HTMLDocument and should create html elements by default.
I didn't test svg handling.

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