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

Of the options, a) seems the best to me. I'm curious though if we'd plan to spec the fallback behavior that Chrome has when there's no way to get the @@toStringTag? 

Tested this:
```js
// @toStringTag is on prototypes, so disconnect the instance from the prototype...
document.__proto__ = null;
// confirm that there's no @toStringTag (or other symbol) on the instance...
Object.getOwnPropertySymbols(document).length == 0
// true
// Ask for the toString of this instance... (grabs its native brand)?
Object.prototype.toString.call(document)
// "[object HTMLDocument]"
```

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