Re: [webidl] DOMException function definition makes no sense (#55)

The current Gecko setup is that `DOMException.__proto__ == Function.prototype` and `DOMException.prototype.__proto__ == Error.prototype`.  We don't really implement supercall at all yet, so the supercall question is a bit fishy, but the brand we use internally for Object.prototype.toString is set to "DOMException" for `DOMException` instances, like it is for other IDL interfaces.

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https://github.com/heycam/webidl/issues/55#issuecomment-119693688