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

Source/core/rendering/TextAutosizer.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 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 87 matching lines @@
 
     return (ancestor && ancestor->isListItem()) ? toRenderListItem(ancestor) : 0;
 }
 
 static RenderObject* getAncestorList(const RenderObject* renderer)
 {
     // FIXME: Add support for <menu> elements as a possible ancestor of an <li> element,
     // see http://www.whatwg.org/specs/web-apps/current-work/multipage/grouping-content.html#the-li-element
     for (RenderObject* ancestor = renderer->parent(); ancestor; ancestor = ancestor->parent()) {
         Node* parentNode = ancestor->generatingNode();
-        if (parentNode && (parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag)))
+        if (parentNode && (isHTMLOListElement(*parentNode) || isHTMLUListElement(*parentNode)))
             return ancestor;
     }
     return 0;
 }
 
 static Node* getGeneratingElementNode(const RenderObject* renderer)
 {
     Node* node = renderer->generatingNode();
     return (node && node->isElementNode()) ? node : 0;
 }
@@ skipping 322 matching lines @@
     newStyle->setTextAutosizingMultiplier(multiplier);
     newStyle->setUnique();
     renderer->setStyle(newStyle.release());
 }
 
 void TextAutosizer::setMultiplierForList(RenderObject* renderer, float multiplier)
 {
 #ifndef NDEBUG
     Node* parentNode = renderer->generatingNode();
     ASSERT(parentNode);
-    ASSERT(parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag));
+    ASSERT(isHTMLOListElement(parentNode) || isHTMLUListElement(parentNode));
 #endif
     setMultiplier(renderer, multiplier);
 
     // Make sure all list items are autosized consistently.
     for (RenderObject* child = renderer->firstChild(); child; child = child->nextSibling()) {
         if (child->isListItem() && child->style()->textAutosizingMultiplier() == 1)
             setMultiplier(child, multiplier);
     }
 }
 
@@ skipping 377 matching lines @@
         if (i + 1 < clusterInfos.size()) {
             LayoutUnit currentWidth = clusterInfos[i].root->contentLogicalWidth();
             LayoutUnit nextWidth = clusterInfos[i + 1].root->contentLogicalWidth();
             if (currentWidth - nextWidth > maxWidthDifferenceWithinGroup)
                 groups.grow(groups.size() + 1);
         }
     }
 }
 
 } // namespace WebCore