Have Node::document() return a reference instead of a pointer

Source/core/rendering/FlowThreadController.cpp

 /*
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 49 matching lines @@
     if (!m_renderNamedFlowThreadList)
         m_renderNamedFlowThreadList = adoptPtr(new RenderNamedFlowThreadList());
     else {
         for (RenderNamedFlowThreadList::iterator iter = m_renderNamedFlowThreadList->begin(); iter != m_renderNamedFlowThreadList->end(); ++iter) {
             RenderNamedFlowThread* flowRenderer = *iter;
             if (flowRenderer->flowThreadName() == name)
                 return flowRenderer;
         }
     }
 
-    NamedFlowCollection* namedFlows = m_view->document()->namedFlows();
+    NamedFlowCollection* namedFlows = m_view->document().namedFlows();
 
     // Sanity check for the absence of a named flow in the "CREATED" state with the same name.
     ASSERT(!namedFlows->flowByName(name));
 
-    RenderNamedFlowThread* flowRenderer = RenderNamedFlowThread::createAnonymous(m_view->document(), namedFlows->ensureFlowWithName(name));
+    RenderNamedFlowThread* flowRenderer = RenderNamedFlowThread::createAnonymous(&m_view->document(), namedFlows->ensureFlowWithName(name));
     flowRenderer->setStyle(RenderFlowThread::createFlowThreadStyle(m_view->style()));
     m_renderNamedFlowThreadList->add(flowRenderer);
 
     // Keep the flow renderer as a child of RenderView.
     m_view->addChild(flowRenderer);
 
     setIsRenderNamedFlowThreadOrderDirty(true);
 
     return flowRenderer;
 }
@@ skipping 153 matching lines @@
     for (RenderNamedFlowThreadList::iterator iter = m_renderNamedFlowThreadList->begin(); iter != m_renderNamedFlowThreadList->end(); ++iter) {
         if (!(*iter)->isAutoLogicalHeightRegionsCountConsistent())
             return false;
     }
 
     return true;
 }
 #endif
 
 } // namespace WebCore