Pass rootNode by reference when constructing node lists / collections

Source/core/dom/NodeRareData.h

Index: Source/core/dom/NodeRareData.h
diff --git a/Source/core/dom/NodeRareData.h b/Source/core/dom/NodeRareData.h
index bb1e55f563009da7b59a0cd4eff8a3422ccae689..b127e7eed1e05be94243493905fe82bbf5d5e0b1 100644
--- a/Source/core/dom/NodeRareData.h
+++ b/Source/core/dom/NodeRareData.h
@@ -50,7 +50,7 @@ public:
             toChildNodeList(m_childNodeList)->invalidateCache();
     }
 
-    PassRefPtr<ChildNodeList> ensureChildNodeList(ContainerNode* node)
+    PassRefPtr<ChildNodeList> ensureChildNodeList(ContainerNode& node)
     {
         if (m_childNodeList)
             return toChildNodeList(m_childNodeList);
@@ -59,7 +59,7 @@ public:
         return list.release();
     }
 
-    PassRefPtr<EmptyNodeList> ensureEmptyChildNodeList(Node* node)
+    PassRefPtr<EmptyNodeList> ensureEmptyChildNodeList(Node& node)
     {
         if (m_childNodeList)
             return toEmptyNodeList(m_childNodeList);
@@ -97,7 +97,7 @@ public:
     typedef HashMap<QualifiedName, TagCollection*> TagCollectionCacheNS;
 
     template<typename T>
-    PassRefPtr<T> addCache(ContainerNode* node, CollectionType collectionType, const AtomicString& name)
+    PassRefPtr<T> addCache(ContainerNode& node, CollectionType collectionType, const AtomicString& name)
     {
         NodeListAtomicNameCacheMap::AddResult result = m_atomicNameCaches.add(namedNodeListKey(collectionType, name), 0);
         if (!result.isNewEntry)
@@ -109,7 +109,7 @@ public:
     }
 
     template<typename T>
-    PassRefPtr<T> addCache(ContainerNode* node, CollectionType collectionType)
+    PassRefPtr<T> addCache(ContainerNode& node, CollectionType collectionType)
     {
         NodeListAtomicNameCacheMap::AddResult result = m_atomicNameCaches.add(namedNodeListKey(collectionType, starAtom), 0);
         if (!result.isNewEntry)
@@ -126,7 +126,7 @@ public:
         return static_cast<T*>(m_atomicNameCaches.get(namedNodeListKey(collectionType, starAtom)));
     }
 
-    PassRefPtr<TagCollection> addCache(ContainerNode* node, const AtomicString& namespaceURI, const AtomicString& localName)
+    PassRefPtr<TagCollection> addCache(ContainerNode& node, const AtomicString& namespaceURI, const AtomicString& localName)
     {
         QualifiedName name(nullAtom, localName, namespaceURI);
         TagCollectionCacheNS::AddResult result = m_tagCollectionCacheNS.add(name, 0);