Re: [dom] Provide getAttributeNames() which returns an Array<DOMString> (#115)

That sounds pretty nice, not unlike `Object.getOwnPropertyNames`.

My biggest question mark is around namespaces, without which this would be a simple API. Because of them, one can't return an array of strings where each string points a unique attribute:
```JavaScript
var e = document.createElement('span');
e.setAttributeNS('http://a.example.com/', 'foo', 'bar');
e.setAttributeNS('http://b.example.com/', 'foo', 'baz');
alert(e.getAttribute('foo'));
e.removeAttribute('foo');
alert(e.getAttribute('foo'));
```

I'n sure you could come up with a crazy case involving prefixes too.

Should the API throw an exception if any of the attributes are in a namespace, or return a tuple of strings instead of a string for those cases?

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