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

Source/core/rendering/RenderDetailsMarker.cpp

 /*
  * Copyright (C) 2010, 2011 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/rendering/RenderDetailsMarker.h"
 
 #include "HTMLNames.h"
 #include "core/dom/Element.h"
+#include "core/html/HTMLElement.h"
 #include "core/rendering/PaintInfo.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
 RenderDetailsMarker::RenderDetailsMarker(Element* element)
     : RenderBlockFlow(element)
 {
@@ skipping 98 matching lines @@
 
     boxOrigin.move(borderLeft() + paddingLeft(), borderTop() + paddingTop());
     paintInfo.context->fillPath(getPath(boxOrigin));
 }
 
 bool RenderDetailsMarker::isOpen() const
 {
     for (RenderObject* renderer = parent(); renderer; renderer = renderer->parent()) {
         if (!renderer->node())
             continue;
-        if (renderer->node()->hasTagName(detailsTag))
+        if (isHTMLDetailsElement(*renderer->node()))
             return !toElement(renderer->node())->getAttribute(openAttr).isNull();
-        if (renderer->node()->hasTagName(inputTag))
+        if (isHTMLInputElement(*renderer->node()))
             return true;
     }
 
     return false;
 }
 
 }