Make InlineBox::renderer() and related subclass methods return reference.

Source/core/rendering/RootInlineBox.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 17 matching lines @@
 
 class EllipsisBox;
 class HitTestResult;
 class RenderBlockFlow;
 
 struct BidiStatus;
 struct GapRects;
 
 class RootInlineBox : public InlineFlowBox {
 public:
-    explicit RootInlineBox(RenderBlockFlow*);
+    explicit RootInlineBox(RenderBlockFlow&);
 
     virtual void destroy() OVERRIDE FINAL;
 
     virtual bool isRootInlineBox() const OVERRIDE FINAL { return true; }
 
     void detachEllipsisBox();
 
     RootInlineBox* nextRootBox() const { return static_cast<RootInlineBox*>(m_nextLineBox); }
     RootInlineBox* prevRootBox() const { return static_cast<RootInlineBox*>(m_prevLineBox); }
 
@@ skipping 69 matching lines @@
 
     using InlineBox::hasSelectedChildren;
     using InlineBox::setHasSelectedChildren;
 
     virtual RenderObject::SelectionState selectionState() OVERRIDE FINAL;
     InlineBox* firstSelectedBox();
     InlineBox* lastSelectedBox();
 
     GapRects lineSelectionGap(RenderBlock* rootBlock, const LayoutPoint& rootBlockPhysicalPosition, const LayoutSize& offsetFromRootBlock, LayoutUnit selTop, LayoutUnit selHeight, const PaintInfo*);
 
-    RenderBlockFlow* block() const;
+    RenderBlockFlow& block() const;
 
     InlineBox* closestLeafChildForPoint(const IntPoint&, bool onlyEditableLeaves);
     InlineBox* closestLeafChildForLogicalLeftPosition(int, bool onlyEditableLeaves = false);
 
     void appendFloat(RenderBox* floatingBox)
     {
         ASSERT(!isDirty());
         if (m_floats)
             m_floats->append(floatingBox);
         else
@@ skipping 93 matching lines @@
     OwnPtr<LineFragmentationData> m_fragmentationData;
 
     // Floats hanging off the line are pushed into this vector during layout. It is only
     // good for as long as the line has not been marked dirty.
     OwnPtr<Vector<RenderBox*> > m_floats;
 };
 
 } // namespace WebCore
 
 #endif // RootInlineBox_h