Don't use stale compositing state in LocalFrame::nodeImage

Source/core/frame/LocalFrame.h

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999-2001 Lars Knoll <knoll@kde.org>
  *                     1999-2001 Antti Koivisto <koivisto@kde.org>
  *                     2000-2001 Simon Hausmann <hausmann@kde.org>
  *                     2000-2001 Dirk Mueller <mueller@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
@@ skipping 111 matching lines @@
         double devicePixelRatio() const;
 
         // Orientation is the interface orientation in degrees. Some examples are:
         //  0 is straight up; -90 is when the device is rotated 90 clockwise;
         //  90 is when rotated counter clockwise.
         void sendOrientationChangeEvent(int orientation);
         int orientation() const { return m_orientation; }
 
         String documentTypeString() const;
 
-        PassOwnPtr<DragImage> nodeImage(Node*);
+        PassOwnPtr<DragImage> nodeImage(Node&);
         PassOwnPtr<DragImage> dragImageForSelection();
 
         String selectedText() const;
         String selectedTextForClipboard() const;
 
         VisiblePosition visiblePositionForPoint(const IntPoint& framePoint);
         Document* documentAtPoint(const IntPoint& windowPoint);
         PassRefPtr<Range> rangeForPoint(const IntPoint& framePoint);
 
         // Should only be called on the main frame of a page.
@@ skipping 96 matching lines @@
     {
         ASSERT(m_eventHandler);
         return *m_eventHandler;
     }
 
     DEFINE_TYPE_CASTS(LocalFrame, Frame, localFrame, localFrame->isLocalFrame(), localFrame.isLocalFrame());
 
 } // namespace WebCore
 
 #endif // LocalFrame_h