Re: [whatwg/dom] DOMTokenList.remove() can add an attribute (#462)

Another related issue about ```replace()```.

```
var c = document.createElement('div');
c.className = 'a a a b';
c.classList.replace('c', 'd');
alert('"' + c.getAttribute('class') + '"');
```

Both of Safari TP and Firefox nightly shows "a a a b" and Element-classlist.html expects it though it should be "a b" according to the DOM standard.


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