- fixed regression from svn revision 16982 that was generating the wrong Obj-C classes

        The hash table to look up an element class given a QualifiedName was
        not working at all.

        * dom/QualifiedName.h:
        (WebCore::QualifiedName::impl):
        Added. This new accessor method for impl is needed if we want to use
        a QualifiedName as a hash table key without doing the kind of specialization
        we do for String. Maybe later we can do the String thing.

        * bindings/objc/DOM.mm:
        (WebCore::addElementClass):
        Use QualifiedName.impl instead of the QualifiedName pointer itself.
        The QualifiedName pointer is *not* unique so almost nothing would be found
        in this hash table!
        (WebCore::elementClass):
        ditto



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@16997 268f45cc-cd09-0410-ab3c-d52691b4dbfc