Have NodeRareData's ensureNodeLists() / ensureMutationObserverData() return a reference

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 8bc3ccdca6c806b475188ef8ba61f5c6f99c2438..887be4f527b249c62ca9f98a25a901b23191821e 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -3009,15 +3009,15 @@ PassRefPtr<HTMLCollection> Element::ensureCachedHTMLCollection(CollectionType ty
     RefPtr<HTMLCollection> collection;
     if (type == TableRows) {
         ASSERT(hasTagName(tableTag));
-        return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLTableRowsCollection>(this, type);
+        return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLTableRowsCollection>(this, type);
     } else if (type == SelectOptions) {
         ASSERT(hasTagName(selectTag));
-        return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLOptionsCollection>(this, type);
+        return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLOptionsCollection>(this, type);
     } else if (type == FormControls) {
         ASSERT(hasTagName(formTag) || hasTagName(fieldsetTag));
-        return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLFormControlsCollection>(this, type);
+        return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLFormControlsCollection>(this, type);
     }
-    return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLCollection>(this, type);
+    return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLCollection>(this, type);
 }
 
 static void scheduleLayerUpdateCallback(Node* node)