Refactoring: toHTMLElement(const Node*) added but never used. Using it.

Source/core/editing/MarkupAccumulator.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 520 matching lines @@
 
 bool MarkupAccumulator::elementCannotHaveEndTag(const Node* node)
 {
     if (!node->isHTMLElement())
         return false;
 
     // FIXME: ieForbidsInsertHTML may not be the right function to call here
     // ieForbidsInsertHTML is used to disallow setting innerHTML/outerHTML
     // or createContextualFragment.  It does not necessarily align with
     // which elements should be serialized w/o end tags.
-    return static_cast<const HTMLElement*>(node)->ieForbidsInsertHTML();
+    return toHTMLElement(node)->ieForbidsInsertHTML();
 }
 
 void MarkupAccumulator::appendEndMarkup(StringBuilder& result, const Node* node)
 {
     if (!node->isElementNode() || shouldSelfClose(node) || (!node->hasChildNodes() && elementCannotHaveEndTag(node)))
         return;
 
     result.append('<');
     result.append('/');
     result.append(toElement(node)->nodeNamePreservingCase());
     result.append('>');
 }
 
 }