Return transform from transformationForTextBox instead of using out-param

Source/core/rendering/svg/SVGTextChunkBuilder.h

 /*
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 22 matching lines @@
 // Phase one built the layout information from the SVG DOM stored in the RenderSVGInlineText objects (SVGTextLayoutAttributes).
 // Phase two performed the actual per-character layout, computing the final positions for each character, stored in the SVGInlineTextBox objects (SVGTextFragment).
 // Phase three performs all modifications that have to be applied to each individual text chunk (text-anchor & textLength).
 
 class SVGTextChunkBuilder {
     WTF_MAKE_NONCOPYABLE(SVGTextChunkBuilder);
 public:
     SVGTextChunkBuilder();
 
     const Vector<SVGTextChunk>& textChunks() const { return m_textChunks; }
-    void transformationForTextBox(SVGInlineTextBox*, AffineTransform&) const;
+    AffineTransform transformationForTextBox(SVGInlineTextBox*) const;
 
     void buildTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes);
     void layoutTextChunks(Vector<SVGInlineTextBox*>& lineLayoutBoxes);
 
 private:
     void addTextChunk(Vector<SVGInlineTextBox*>& lineLayoutBoxes, unsigned boxPosition, unsigned boxCount);
     void processTextChunk(const SVGTextChunk&);
 
     void processTextLengthSpacingCorrection(bool isVerticalText, float textLengthShift, Vector<SVGTextFragment>&, unsigned& atCharacter);
     void processTextAnchorCorrection(bool isVerticalText, float textAnchorShift, Vector<SVGTextFragment>&);
 
 private:
     Vector<SVGTextChunk> m_textChunks;
     HashMap<SVGInlineTextBox*, AffineTransform> m_textBoxTransformations;
 };
 
 } // namespace WebCore
 
 #endif