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

Source/core/rendering/InlineTextBox.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2009, 2010, 2011 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.
  *
@@ skipping 25 matching lines @@
 
 const unsigned short cNoTruncation = USHRT_MAX;
 const unsigned short cFullTruncation = USHRT_MAX - 1;
 
 // Helper functions shared by InlineTextBox / SVGRootInlineBox
 void updateGraphicsContext(GraphicsContext*, const Color& fillColor, const Color& strokeColor, float strokeThickness, ColorSpace);
 Color correctedTextColor(Color textColor, Color backgroundColor);
 
 class InlineTextBox : public InlineBox {
 public:
-    InlineTextBox(RenderObject* obj)
+    InlineTextBox(RenderObject& obj)
         : InlineBox(obj)
         , m_prevTextBox(0)
         , m_nextTextBox(0)
         , m_start(0)
         , m_len(0)
         , m_truncation(cNoTruncation)
     {
     }
 
     virtual void destroy() OVERRIDE FINAL;
@@ skipping 58 matching lines @@
 
     virtual LayoutRect localSelectionRect(int startPos, int endPos);
     bool isSelected(int startPos, int endPos) const;
     void selectionStartEnd(int& sPos, int& ePos);
 
 protected:
     virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
     virtual bool nodeAtPoint(const HitTestRequest&, HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE;
 
 public:
-    RenderText* textRenderer() const;
+    RenderText& textRenderer() const;
 
 private:
     virtual void deleteLine() OVERRIDE FINAL;
     virtual void extractLine() OVERRIDE FINAL;
     virtual void attachLine() OVERRIDE FINAL;
 
 public:
     virtual RenderObject::SelectionState selectionState() OVERRIDE FINAL;
 
 private:
@@ skipping 54 matching lines @@
 
     TextRun::ExpansionBehavior expansionBehavior() const
     {
         return (canHaveLeadingExpansion() ? TextRun::AllowLeadingExpansion : TextRun::ForbidLeadingExpansion)
             | (expansion() && nextLeafChild() ? TextRun::AllowTrailingExpansion : TextRun::ForbidTrailingExpansion);
     }
 };
 
 DEFINE_INLINE_BOX_TYPE_CASTS(InlineTextBox);
 
-inline RenderText* InlineTextBox::textRenderer() const
+inline RenderText& InlineTextBox::textRenderer() const
 {
     return toRenderText(renderer());
 }
 
 void alignSelectionRectToDevicePixels(FloatRect&);
 
 inline AffineTransform InlineTextBox::rotation(const FloatRect& boxRect, RotationDirection rotationDirection)
 {
     return rotationDirection == Clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
         : AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
 }
 
 } // namespace WebCore
 
 #endif // InlineTextBox_h