Re: [heycam/webidl] Should probably spec a hasInstance for DOM interface objects (#129)

@travisleithead the Firefox behavior is basically the one described in <https://github.com/heycam/webidl/issues/129#issue-158959537>.  Your case 1 passes because of step 6, and case 2 passes because of step 7.  But case 3 doesn't match in step 6 and as far as `OrdinaryHasInstance` is concerned that object has nothing to do with `w.DOMImplementation`.

I don't see any need for case 3 to pass in practice, honestly....  I _think_ case 2 passing may be needed for web compat.  Or at least I would need some convincing that it's _not_ needed.

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