Use more const references in HTMLCollection / LiveNodeList

Source/core/html/HTMLOptionElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Motorola Mobility, Inc.  All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 183 matching lines @@
     if (!value.isNull())
         return value;
     return collectOptionInnerText().stripWhiteSpace(isHTMLSpace<UChar>).simplifyWhiteSpace(isHTMLSpace<UChar>);
 }
 
 void HTMLOptionElement::setValue(const AtomicString& value)
 {
     setAttribute(valueAttr, value);
 }
 
-bool HTMLOptionElement::selected()
+bool HTMLOptionElement::selected() const
 {
     if (HTMLSelectElement* select = ownerSelectElement()) {
         // If a stylesheet contains option:checked selectors, this function is
         // called during parsing. updateListItemSelectedStates() is O(N) where N
         // is the number of option elements, so the <select> parsing would be
         // O(N^2) without isParsingInProgress check. Also,
         // updateListItemSelectedStates() determines default selection, and we'd
         // like to avoid to determine default selection with incomplete option
         // list.
         if (select->isParsingInProgress())
@@ skipping 150 matching lines @@
 
 HTMLFormElement* HTMLOptionElement::form() const
 {
     if (HTMLSelectElement* selectElement = ownerSelectElement())
         return selectElement->formOwner();
 
     return 0;
 }
 
 } // namespace WebCore