Have Document::markers() return a reference

Source/core/dom/Node.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 277 matching lines @@
     Document& document = this->document();
 
     if (hasEventTargetData()) {
         clearEventTargetData();
         document.didClearTouchEventHandlers(this);
     }
 
     if (AXObjectCache* cache = document.existingAXObjectCache())
         cache->remove(this);
 
-    document.markers()->removeMarkers(this);
+    document.markers().removeMarkers(this);
 }
 
 NodeRareData* Node::rareData() const
 {
     ASSERT_WITH_SECURITY_IMPLICATION(hasRareData());
     return static_cast<NodeRareData*>(m_data.m_rareData);
 }
 
 NodeRareData& Node::ensureRareData()
 {
@@ skipping 2247 matching lines @@
         node->showTreeForThis();
 }
 
 void showNodePath(const WebCore::Node* node)
 {
     if (node)
         node->showNodePathForThis();
 }
 
 #endif