Use new is*Element() helper functions more in rendering code

Source/core/rendering/RenderCounter.cpp

 /**
  * Copyright (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 130 matching lines @@
             if (toRenderListItem(object).hasExplicitValue()) {
                 value = toRenderListItem(object).explicitValue();
                 isReset = true;
                 return true;
             }
             value = 1;
             isReset = false;
             return true;
         }
         if (Node* e = object.node()) {
-            if (e->hasTagName(olTag)) {
+            if (isHTMLOListElement(*e)) {
                 value = toHTMLOListElement(e)->start();
                 isReset = true;
                 return true;
             }
-            if (e->hasTagName(ulTag) || e->hasTagName(menuTag) || e->hasTagName(dirTag)) {
+            if (isHTMLUListElement(*e) || isHTMLMenuElement(*e) || isHTMLDirectoryElement(*e)) {
                 value = 0;
                 isReset = true;
                 return true;
             }
         }
     }
 
     return false;
 }
 
@@ skipping 442 matching lines @@
             fprintf(stderr, "    ");
         fprintf(stderr, "%p N:%p P:%p PS:%p NS:%p C:%p\n",
             current, current->node(), current->parent(), current->previousSibling(),
             current->nextSibling(), current->hasCounterNodeMap() ?
             counterName ? WebCore::counterMaps().get(current)->get(identifier) : (WebCore::CounterNode*)1 : (WebCore::CounterNode*)0);
     }
     fflush(stderr);
 }
 
 #endif // NDEBUG