Use tighter typing in RadioNodeList::elementMatches()

Source/core/html/RadioNodeList.cpp

 /*
  * Copyright (c) 2012 Motorola Mobility, 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/RadioNodeList.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/Element.h"
 #include "core/dom/NodeRareData.h"
 #include "core/html/HTMLFormElement.h"
+#include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLObjectElement.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 RadioNodeList::RadioNodeList(ContainerNode& rootNode, const AtomicString& name, CollectionType type)
     : LiveNodeList(rootNode, type, InvalidateForFormControls, isHTMLFormElement(rootNode) ? NodeListIsRootedAtDocument : NodeListIsRootedAtNode)
     , m_name(name)
@@ skipping 64 matching lines @@
 
     return matchesByIdOrName(testElement);
 }
 
 bool RadioNodeList::elementMatches(const Element& element) const
 {
     if (m_onlyMatchImgElements) {
         if (!isHTMLImageElement(element))
             return false;
 
-        if (toHTMLElement(element).formOwner() != ownerNode())
+        if (toHTMLImageElement(element).formOwner() != ownerNode())
             return false;
 
         return matchesByIdOrName(element);
     }
 
     if (!isHTMLObjectElement(element) && !element.isFormControlElement())
         return false;
 
     if (isHTMLInputElement(element) && toHTMLInputElement(element).isImageButton())
         return false;
 
     return checkElementMatchesRadioNodeListFilter(element);
 }
 
 } // namespace