Re: [dom] Merge DOMSettableTokenList into DOMTokenList (#119)

In httparchive i only see http://www.gstatic.com/caja/5678/es53-taming-frame.opt.js?debug=1 containing "DOMSettableTokenList.prototype" but it was actually "TameDOMSettableTokenList.prototype".

Looking at all instances of "DOMSettableTokenList" is just a handful of copies of http://kpn.blueconic.net/frontend/static/javascript/blueconic/blueconic.min.js which does
```js
var myGlobalVarBlacklist=["window","top","location","external","chrome", ... ,"DOMSettableTokenList"
```

So probably we don't need to keep `window.DOMSettableTokenList` around.

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