https://bugs.webkit.org/show_bug.cgi?id=120358

Reviewed by Andreas Kling.

* dom/ContainerNode.h:
        
    Delete isContainerNode() so it can't be called if there is static knowledge that the object is a ContainerNode.

* dom/DescendantIterator.h:
(WebCore::::DescendantIterator):

    Make DescendantIterator use Node* as root instead of ContainerNode*. It is only used for equality comparison.

(WebCore::::begin):
        
    Remove branch. Rely on ElementTraversal specialization for ContainerNodes.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154682 268f45cc-cd09-0410-ab3c-d52691b4dbfc