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

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2991 matching lines @@
 }
 
 PassRefPtr<HTMLCollection> Element::ensureCachedHTMLCollection(CollectionType type)
 {
     if (HTMLCollection* collection = cachedHTMLCollection(type))
         return collection;
 
     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)
 {
     // Notify the renderer even is the styles are identical since it may need to
     // create or destroy a RenderLayer.
     node->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer);
 }
 
 void Element::scheduleLayerUpdate()
@@ skipping 708 matching lines @@
     return 0;
 }
 
 Attribute* UniqueElementData::attributeItem(unsigned index)
 {
     ASSERT_WITH_SECURITY_IMPLICATION(index < length());
     return &m_attributeVector.at(index);
 }
 
 } // namespace WebCore