Remove unused mask and background methods.

Source/core/rendering/style/RenderStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 1114 matching lines @@
     bool setEffectiveZoom(float);
 
     void setImageRendering(EImageRendering v) { SET_VAR(rareInheritedData, m_imageRendering, v); }
 
     void setWhiteSpace(EWhiteSpace v) { inherited_flags._white_space = v; }
 
     // FIXME: Remove these two and replace them with respective FontBuilder calls.
     void setWordSpacing(float);
     void setLetterSpacing(float);
 
-    void clearBackgroundLayers() { m_background.access()->m_background = FillLayer(BackgroundFillLayer); }
-    void inheritBackgroundLayers(const FillLayer& parent) { m_background.access()->m_background = parent; }
-
     void adjustBackgroundLayers()
     {
         if (backgroundLayers()->next()) {
             accessBackgroundLayers()->cullEmptyLayers();
             accessBackgroundLayers()->fillUnsetProperties();
         }
     }
 
-    void clearMaskLayers() { rareNonInheritedData.access()->m_mask = FillLayer(MaskFillLayer); }
-    void inheritMaskLayers(const FillLayer& parent) { rareNonInheritedData.access()->m_mask = parent; }
-
     void adjustMaskLayers()
     {
         if (maskLayers()->next()) {
             accessMaskLayers()->cullEmptyLayers();
             accessMaskLayers()->fillUnsetProperties();
         }
     }
 
     void setMaskImage(PassRefPtr<StyleImage> v) { rareNonInheritedData.access()->m_mask.setImage(v); }
 
@@ skipping 723 matching lines @@
 inline bool RenderStyle::hasPseudoElementStyle() const
 {
     return noninherited_flags._pseudoBits & PSEUDO_ELEMENT_MASK;
 }
 
 float calcBorderRadiiConstraintScaleFor(const FloatRect&, const FloatRoundedRect::Radii&);
 
 } // namespace WebCore
 
 #endif // RenderStyle_h