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

Source/core/editing/markup.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009, 2010, 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011 Igalia S.L.
  * Copyright (C) 2011 Motorola Mobility. 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
@@ skipping 465 matching lines @@
     return isEndOfParagraph(v) && isStartOfParagraph(next) && !(upstreamNode->hasTagName(brTag) && upstreamNode == downstreamNode);
 }
 
 static PassRefPtr<EditingStyle> styleFromMatchedRulesAndInlineDecl(const Node* node)
 {
     if (!node->isHTMLElement())
         return 0;
 
     // FIXME: Having to const_cast here is ugly, but it is quite a bit of work to untangle
     // the non-const-ness of styleFromMatchedRulesForElement.
-    HTMLElement* element = const_cast<HTMLElement*>(static_cast<const HTMLElement*>(node));
+    HTMLElement* element = const_cast<HTMLElement*>(toHTMLElement(node));
     RefPtr<EditingStyle> style = EditingStyle::create(element->inlineStyle());
     style->mergeStyleFromRules(element);
     return style.release();
 }
 
 static bool isElementPresentational(const Node* node)
 {
     return node->hasTagName(uTag) || node->hasTagName(sTag) || node->hasTagName(strikeTag)
         || node->hasTagName(iTag) || node->hasTagName(emTag) || node->hasTagName(bTag) || node->hasTagName(strongTag);
 }
@@ skipping 575 matching lines @@
     if (containerNode->hasOneChild()) {
         containerNode->replaceChild(textNode.release(), containerNode->firstChild(), es);
         return;
     }
 
     containerNode->removeChildren();
     containerNode->appendChild(textNode.release(), es);
 }
 
 }