Use more const references in HTMLCollection / LiveNodeList

Source/core/html/HTMLOptionElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * 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
@@ skipping 29 matching lines @@
         bool defaultSelected, bool selected, ExceptionState&);
 
     String text() const;
     void setText(const String&, ExceptionState&);
 
     int index() const;
 
     String value() const;
     void setValue(const AtomicString&);
 
-    bool selected();
+    bool selected() const;
     void setSelected(bool);
 
     HTMLDataListElement* ownerDataListElement() const;
     HTMLSelectElement* ownerSelectElement() const;
 
     String label() const;
     void setLabel(const AtomicString&);
 
     bool ownElementDisabled() const { return m_disabled; }
 
@@ skipping 33 matching lines @@
     bool m_disabled;
     bool m_isSelected;
     RefPtr<RenderStyle> m_style;
 };
 
 DEFINE_NODE_TYPE_CASTS(HTMLOptionElement, hasTagName(HTMLNames::optionTag));
 
 } // namespace WebCore
 
 #endif