Use more const references in HTMLCollection / LiveNodeList

Source/core/html/RadioNodeList.h

 /*
  * 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 30 matching lines @@
     }
 
     virtual ~RadioNodeList();
 
     String value() const;
     void setValue(const String&);
 
 private:
     RadioNodeList(Node*, const AtomicString& name, CollectionType);
 
-    bool checkElementMatchesRadioNodeListFilter(Element*) const;
+    bool checkElementMatchesRadioNodeListFilter(const Element&) const;
 
-    virtual bool nodeMatches(Element*) const OVERRIDE;
+    virtual bool nodeMatches(const Element&) const OVERRIDE;
 
     AtomicString m_name;
     const bool m_onlyMatchImgElements;
 };
 
 } // namespace
 
 #endif