The TreeWalker interface should not have [NoInterfaceObject] according to its specification: http://www.w3.org/TR/DOM-Level-2-Traversal-Range/traversal.html#Traversal-TreeWalker
Firefox follows the specification.
Created attachment 203751 [details] Patch
Created attachment 203753 [details] Patch Rebaseline fast/dom/dom-constructors.html as well.
Comment on attachment 203753 [details] Patch Clearing flags on attachment: 203753 Committed r151200: <http://trac.webkit.org/changeset/151200>
All reviewed patches have been landed. Closing bug.