Re: [heycam/webidl] Only install @@toStringTag on the prototype (#357)

Wow, interesting find. http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=5623 confirms @travisleithead's findings.

http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=5624 shows that in the case @bzbarsky asks about it falls back to `document[Symbol.toStringTag] === Document.prototype[Symbol.toStringTag]` (remember that `document` is a `HTMLDocument` in reality... yeah, we should probably fix that spec/reality mismatch).

http://software.hixie.ch/utilities/js/live-dom-viewer/?saved=5625 shows that if you go all the way down it then reverts to `[object HTMLDocument]`, like in the null-proto case.

So there's some fallback logic in Chrome that is not captured by this spec patch, and is IMO not good and should be removed. I will file a Chrome bug.

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