Re: [whatwg/dom] Future for unique tokens in DOMTokenList (#201)

This is what I get in Safari Tech Preview for this test case:
```js
var el = document.createElement("div");

el.className = " a a b ";
console.log(el.className.length); // 7
console.log(el.classList.length); // 2
console.log(Array.prototype.slice.call(el.classList).join(" ")); // "a b"

el.classList.add("a"); // should remove duplicate and white space in associated attr value

console.log(el.className.length); // 3
console.log(el.classList.length); // 2
console.log(Array.prototype.slice.call(el.classList).join(" ")); // "a b"

el.classList.remove("a");

console.log(el.className.length); // 1
console.log(el.classList.length); // 1
console.log(Array.prototype.slice.call(el.classList).join(" ")); // "b"
```

So it seems to be serializing very aggressively.

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