Fix an optimisation in ContainerNode::notifyNodeInsertedInternal

R=tkent@chromium.org
BUG=544020

Review URL: https://codereview.chromium.org/1420653003

Cr-Commit-Position: refs/heads/master@{#355240}
void ContainerNode::parserTakeAllChildrenFrom(ContainerNode& oldParent)
{
    while (RefPtrWillBeRawPtr<Node> child = oldParent.firstChild()) {
        oldParent.parserRemoveChild(*child);
        parserAppendChild(child.get());
    }
}

void ContainerNode::parserTakeAllChildrenFrom(ContainerNode& oldParent)
{
    while (RefPtrWillBeRawPtr<Node> child = oldParent.firstChild()) {
        oldParent.parserRemoveChild(*child);
        parserAppendChild(child.get());
    }
}
