Re: [heycam/webidl] Is a subclass still a platform object? (#540)

And for extra excitement, here's another interesting testcase:

    <iframe></iframe>
    <script>
    var X = new frames[0].Proxy(Image, {})
    obj = new X();
    w(obj.ownerDocument == document);
    w(obj.ownerDocument == frames[0].document);
    </script>

live at <http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=5859>.  Here Chrome logs `false`, then `true`.  Everyone else logs `true` then `false`.  This doesn't involve subclassing, but shows the same behavior difference.  Basically, Chrome is using the Realm of new.target, not the Realm of the actual constructor, to create objects.  Per that language that's mysteriously disappeared from the IDL spec, that's a Chrome bug.

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