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

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 4244 matching lines @@
     return m_svgExtensions.get();
 }
 
 bool Document::hasSVGRootNode() const
 {
     return documentElement() && documentElement()->hasTagName(SVGNames::svgTag);
 }
 
 PassRefPtr<HTMLCollection> Document::ensureCachedCollection(CollectionType type)
 {
-    return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLCollection>(this, type);
+    return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLCollection>(this, type);
 }
 
 PassRefPtr<HTMLCollection> Document::images()
 {
     return ensureCachedCollection(DocImages);
 }
 
 PassRefPtr<HTMLCollection> Document::applets()
 {
     return ensureCachedCollection(DocApplets);
@@ skipping 31 matching lines @@
 }
 
 PassRefPtr<HTMLCollection> Document::allForBinding()
 {
     UseCounter::count(*this, UseCounter::DocumentAll);
     return all();
 }
 
 PassRefPtr<HTMLCollection> Document::all()
 {
-    return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLAllCollection>(this, DocAll);
+    return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLAllCollection>(this, DocAll);
 }
 
 PassRefPtr<HTMLCollection> Document::windowNamedItems(const AtomicString& name)
 {
-    return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLNameCollection>(this, WindowNamedItems, name);
+    return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLNameCollection>(this, WindowNamedItems, name);
 }
 
 PassRefPtr<HTMLCollection> Document::documentNamedItems(const AtomicString& name)
 {
-    return ensureRareData().ensureNodeLists()->addCacheWithAtomicName<HTMLNameCollection>(this, DocumentNamedItems, name);
+    return ensureRareData().ensureNodeLists().addCacheWithAtomicName<HTMLNameCollection>(this, DocumentNamedItems, name);
 }
 
 void Document::finishedParsing()
 {
     ASSERT(!scriptableDocumentParser() || !m_parser->isParsing());
     ASSERT(!scriptableDocumentParser() || m_readyState != Loading);
     setParsing(false);
     if (!m_documentTiming.domContentLoadedEventStart)
         m_documentTiming.domContentLoadedEventStart = monotonicallyIncreasingTime();
     dispatchEvent(Event::createBubble(EventTypeNames::DOMContentLoaded));
@@ skipping 987 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore