Remove unused GraphicsLayerAnimation

Source/core/platform/animation/TimingFunction.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 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 116 matching lines @@
         }
         return false;
     }
 
     double x1() const { return m_x1; }
     double y1() const { return m_y1; }
     double x2() const { return m_x2; }
     double y2() const { return m_y2; }
     
     TimingFunctionPreset timingFunctionPreset() const { return m_timingFunctionPreset; }
-    
-    static const CubicBezierTimingFunction* defaultTimingFunction()
-    {
-        static const CubicBezierTimingFunction* dtf = create().leakRef();
-        return dtf;
-    }
-    
+
 private:
     explicit CubicBezierTimingFunction(TimingFunctionPreset preset = Ease, double x1 = 0.25, double y1 = 0.1, double x2 = 0.25, double y2 = 1.0)
         : TimingFunction(CubicBezierFunction)
         , m_x1(x1)
         , m_y1(y1)
         , m_x2(x2)
         , m_y2(y2)
         , m_timingFunctionPreset(preset)
     {
     }
@@ skipping 34 matching lines @@
     {
     }
     
     int m_steps;
     bool m_stepAtStart;
 };
     
 } // namespace WebCore
 
 #endif // TimingFunction_h