Pass rootNode by reference when constructing node lists / collections

Source/core/html/HTMLCollection.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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 140 matching lines @@
     case NameNodeListType:
     case RadioNodeListType:
     case RadioImgNodeListType:
     case LabelsNodeListType:
         break;
     }
     ASSERT_NOT_REACHED();
     return DoNotInvalidateOnAttributeChanges;
 }
 
-HTMLCollection::HTMLCollection(ContainerNode* ownerNode, CollectionType type, ItemAfterOverrideType itemAfterOverrideType)
+HTMLCollection::HTMLCollection(ContainerNode& ownerNode, CollectionType type, ItemAfterOverrideType itemAfterOverrideType)
     : LiveNodeListBase(ownerNode, rootTypeFromCollectionType(type), invalidationTypeExcludingIdAndNameAttributes(type), type)
     , m_overridesItemAfter(itemAfterOverrideType == OverridesItemAfter)
     , m_shouldOnlyIncludeDirectChildren(shouldTypeOnlyIncludeDirectChildren(type))
     , m_hasValidIdNameCache(false)
 {
     ScriptWrappable::init(this);
 }
 
-PassRefPtr<HTMLCollection> HTMLCollection::create(ContainerNode* base, CollectionType type)
+PassRefPtr<HTMLCollection> HTMLCollection::create(ContainerNode& base, CollectionType type)
 {
     return adoptRef(new HTMLCollection(base, type, DoesNotOverrideItemAfter));
 }
 
 HTMLCollection::~HTMLCollection()
 {
     if (hasValidIdNameCache())
         unregisterIdNameCacheFromDocument(document());
     // HTMLNameCollection, ClassCollection and TagCollection remove cache by themselves.
     if (type() != WindowNamedItems && type() != DocumentNamedItems && type() != ClassCollectionType
@@ skipping 297 matching lines @@
 
 void HTMLCollection::append(NodeCacheMap& map, const AtomicString& key, Element* element)
 {
     OwnPtr<Vector<Element*> >& vector = map.add(key.impl(), nullptr).storedValue->value;
     if (!vector)
         vector = adoptPtr(new Vector<Element*>);
     vector->append(element);
 }
 
 } // namespace WebCore