Have LiveNodeListBase::ownerNode() return a reference

Source/core/dom/TagCollection.cpp

Index: Source/core/dom/TagCollection.cpp
diff --git a/Source/core/dom/TagCollection.cpp b/Source/core/dom/TagCollection.cpp
index 275d942f0dda70478d227af6f6fca7772d9158cb..3a20c24b8b981ff724ba8d83f381f9c6e4524e6a 100644
--- a/Source/core/dom/TagCollection.cpp
+++ b/Source/core/dom/TagCollection.cpp
@@ -40,9 +40,9 @@ TagCollection::TagCollection(ContainerNode* rootNode, CollectionType type, const
 TagCollection::~TagCollection()
 {
     if (m_namespaceURI == starAtom)
-        ownerNode()->nodeLists()->removeCache(this, type(), m_localName);
+        ownerNode().nodeLists()->removeCache(this, type(), m_localName);
     else
-        ownerNode()->nodeLists()->removeCache(this, m_namespaceURI, m_localName);
+        ownerNode().nodeLists()->removeCache(this, m_namespaceURI, m_localName);
 }
 
 bool TagCollection::elementMatches(const Element& testNode) const