Fix another NodeIterator removing step

[Joris-van-der-Wel]

This change makes it more consistent with the other rules. Also,
it is what the w3c test suite expects and how the browsers behave.

Here's a quick snippit to test:

document.body.innerHTML = "<p>Efghijkl</p><p>Mnopqrst</p>";
var it = document.createNodeIterator(document);
while (it.nextNode());

var removed = document.body.children[1];
removed.parentNode.removeChild(removed);

console.info(it.referenceNode === document.body.children[0].lastChild);
console.info(it.pointerBeforeReferenceNode === false);

[annevk]

So if I want to integrate this and preserve authorship I need your email address...

[domenic]

I always use .patch URLs for that