Improve RAII of StyleResolverState.

Source/core/css/CSSToLengthConversionData.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 38 matching lines @@
     const RenderStyle* rootStyle() const { return m_rootStyle; }
     float zoom() const;
     bool computingFontSize() const { return m_computingFontSize; }
 
     // Accessing these marks the style as having viewport units
     double viewportWidthPercent() const;
     double viewportHeightPercent() const;
     double viewportMinPercent() const;
     double viewportMaxPercent() const;
 
-    void setStyle(const RenderStyle* style) { m_style = style; }
-    void setRootStyle(const RenderStyle* rootStyle) { m_rootStyle = rootStyle; }
-
     CSSToLengthConversionData copyWithAdjustedZoom(float newZoom) const
     {
         return CSSToLengthConversionData(m_style, m_rootStyle, m_viewportWidth, m_viewportHeight, newZoom, m_computingFontSize);
     }
 
 private:
     const RenderStyle* m_style;
     const RenderStyle* m_rootStyle;
     float m_viewportWidth;
     float m_viewportHeight;
     float m_zoom;
     bool m_useEffectiveZoom;
     bool m_computingFontSize;
 };
 
 } // namespace blink
 
 #endif