Have LiveNodeListBase::ownerNode() return a reference

Source/core/html/HTMLNameCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2011, 2012 Apple 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
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 24 matching lines @@
 using namespace HTMLNames;
 
 HTMLNameCollection::HTMLNameCollection(ContainerNode* document, CollectionType type, const AtomicString& name)
     : HTMLCollection(document, type, OverridesItemAfter)
     , m_name(name)
 {
 }
 
 HTMLNameCollection::~HTMLNameCollection()
 {
-    ASSERT(ownerNode());
-    ASSERT(ownerNode()->isDocumentNode());
+    ASSERT(ownerNode().isDocumentNode());
     ASSERT(type() == WindowNamedItems || type() == DocumentNamedItems);
 
-    ownerNode()->nodeLists()->removeCache(this, type(), m_name);
+    ownerNode().nodeLists()->removeCache(this, type(), m_name);
 }
 
 Element* HTMLNameCollection::virtualItemAfter(Element* previous) const
 {
     ASSERT(previous != ownerNode());
 
     Element* current;
     if (!previous)
-        current = ElementTraversal::firstWithin(*ownerNode());
+        current = ElementTraversal::firstWithin(ownerNode());
     else
-        current = ElementTraversal::next(*previous, ownerNode());
+        current = ElementTraversal::next(*previous, &ownerNode());
 
-    for (; current; current = ElementTraversal::next(*current, ownerNode())) {
+    for (; current; current = ElementTraversal::next(*current, &ownerNode())) {
         switch (type()) {
         case WindowNamedItems:
             // find only images, forms, applets, embeds and objects by name,
             // but anything by id
             if (current->hasTagName(imgTag)
                 || current->hasTagName(formTag)
                 || current->hasTagName(appletTag)
                 || current->hasTagName(embedTag)
                 || current->hasTagName(objectTag)) {
                 if (current->getNameAttribute() == m_name)
@@ skipping 22 matching lines @@
             break;
         default:
             ASSERT_NOT_REACHED();
         }
     }
 
     return 0;
 }
 
 }