Use Length for baselineShiftValue in SVGLayoutStyle

Source/core/layout/svg/SVGTextLayoutEngineBaseline.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef SVGTextLayoutEngineBaseline_h
 #define SVGTextLayoutEngineBaseline_h
 
 #include "core/layout/style/SVGLayoutStyleDefs.h"
 #include "wtf/Noncopyable.h"
 
 namespace blink {
 
 class Font;
 class LayoutObject;
-class SVGElement;
+class LayoutStyle;
 class SVGLayoutStyle;
 class SVGTextMetrics;
 
 // Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
 class SVGTextLayoutEngineBaseline {
     WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
 public:
     SVGTextLayoutEngineBaseline(const Font&);
 
-    float calculateBaselineShift(const SVGLayoutStyle&, SVGElement* lengthContext) const;
+    float calculateBaselineShift(const LayoutStyle&) const;
     float calculateAlignmentBaselineShift(bool isVerticalText, const LayoutObject* textRenderer) const;
     float calculateGlyphOrientationAngle(bool isVerticalText, const SVGLayoutStyle&, const UChar& character) const;
     float calculateGlyphAdvanceAndOrientation(bool isVerticalText, const SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
 
 private:
     EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const LayoutObject* textRenderer) const;
 
     const Font& m_font;
 };
 
 } // namespace blink
 
 #endif