Return refererence from InlineBox::root()

Source/core/editing/RenderedPosition.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 class VisiblePosition;
 
 class RenderedPosition {
 public:
     RenderedPosition();
     explicit RenderedPosition(const VisiblePosition&);
     explicit RenderedPosition(const Position&, EAffinity);
     bool isEquivalent(const RenderedPosition&) const;
 
     bool isNull() const { return !m_renderer; }
-    RootInlineBox* rootBox() { return m_inlineBox ? m_inlineBox->root() : 0; }
+    RootInlineBox* rootBox() { return m_inlineBox ? &m_inlineBox->root() : 0; }
 
     unsigned char bidiLevelOnLeft() const;
     unsigned char bidiLevelOnRight() const;
     RenderedPosition leftBoundaryOfBidiRun(unsigned char bidiLevelOfRun);
     RenderedPosition rightBoundaryOfBidiRun(unsigned char bidiLevelOfRun);
 
     enum ShouldMatchBidiLevel { MatchBidiLevel, IgnoreBidiLevel };
     bool atLeftBoundaryOfBidiRun() const { return atLeftBoundaryOfBidiRun(IgnoreBidiLevel, 0); }
     bool atRightBoundaryOfBidiRun() const { return atRightBoundaryOfBidiRun(IgnoreBidiLevel, 0); }
     // The following two functions return true only if the current position is at the end of the bidi run
@@ skipping 44 matching lines @@
     , m_prevLeafChild(uncachedInlineBox())
     , m_nextLeafChild(uncachedInlineBox())
 {
 }
 
 bool renderObjectContainsPosition(RenderObject*, const Position&);
 
 };
 
 #endif // RenderedPosition_h