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

Source/core/rendering/EllipsisBox.h

 /**
  * Copyright (C) 2003, 2006 Apple Computer, Inc.
  *
  * 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 11 matching lines @@
 
 #include "core/rendering/InlineBox.h"
 
 namespace WebCore {
 
 class HitTestRequest;
 class HitTestResult;
 
 class EllipsisBox FINAL : public InlineBox {
 public:
-    EllipsisBox(RenderObject* obj, const AtomicString& ellipsisStr, InlineFlowBox* parent,
+    EllipsisBox(RenderObject& obj, const AtomicString& ellipsisStr, InlineFlowBox* parent,
         int width, int height, int x, int y, bool firstLine, bool isVertical, InlineBox* markupBox)
         : InlineBox(obj, FloatPoint(x, y), width, firstLine, true, false, false, isVertical, 0, 0, parent)
         , m_shouldPaintMarkupBox(markupBox)
         , m_height(height)
         , m_str(ellipsisStr)
         , m_selectionState(RenderObject::SelectionNone)
     {
         setHasVirtualLogicalHeight();
     }
 
@@ skipping 12 matching lines @@
 
     bool m_shouldPaintMarkupBox;
     int m_height;
     AtomicString m_str;
     RenderObject::SelectionState m_selectionState;
 };
 
 } // namespace WebCore
 
 #endif // EllipsisBox_h