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

Source/core/rendering/svg/SVGInlineFlowBox.cpp

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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 32 matching lines @@
         else if (child->isSVGInlineFlowBox())
             toSVGInlineFlowBox(child)->paintSelectionBackground(childPaintInfo);
     }
 }
 
 void SVGInlineFlowBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit, LayoutUnit)
 {
     ASSERT(paintInfo.phase == PaintPhaseForeground || paintInfo.phase == PaintPhaseSelection);
     ASSERT(!paintInfo.context->paintingDisabled());
 
-    RenderObject* boxRenderer = renderer();
-    ASSERT(boxRenderer);
-
-    SVGRenderingContext renderingContext(boxRenderer, paintInfo, SVGRenderingContext::SaveGraphicsContext);
+    SVGRenderingContext renderingContext(&renderer(), paintInfo, SVGRenderingContext::SaveGraphicsContext);
     if (renderingContext.isRenderingPrepared()) {
         for (InlineBox* child = firstChild(); child; child = child->nextOnLine())
             child->paint(paintInfo, paintOffset, 0, 0);
     }
 }
 
 FloatRect SVGInlineFlowBox::calculateBoundaries() const
 {
     FloatRect childRect;
     for (InlineBox* child = firstChild(); child; child = child->nextOnLine()) {
         if (!child->isSVGInlineTextBox() && !child->isSVGInlineFlowBox())
             continue;
         childRect.unite(child->calculateBoundaries());
     }
     return childRect;
 }
 
 } // namespace WebCore