Remove superfluous CSSLinearTimingFunctionValue

Source/core/css/CSSTimingFunctionValue.h

 /*
  * Copyright (C) 2007, 2008, 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 13 matching lines @@
  */
 
 #ifndef CSSTimingFunctionValue_h
 #define CSSTimingFunctionValue_h
 
 #include "core/css/CSSValue.h"
 #include "wtf/PassRefPtr.h"
 
 namespace WebCore {
 
-class CSSLinearTimingFunctionValue : public CSSValue {
-public:
-    static PassRefPtr<CSSLinearTimingFunctionValue> create()
-    {
-        return adoptRef(new CSSLinearTimingFunctionValue);
-    }
-
-    String customCssText() const;
-
-    bool equals(const CSSLinearTimingFunctionValue&) const { return true; }
-
-private:
-    CSSLinearTimingFunctionValue()
-        : CSSValue(LinearTimingFunctionClass)
-    {
-    }
-};
-
 class CSSCubicBezierTimingFunctionValue : public CSSValue {
 public:
     static PassRefPtr<CSSCubicBezierTimingFunctionValue> create(double x1, double y1, double x2, double y2)
     {
         return adoptRef(new CSSCubicBezierTimingFunctionValue(x1, y1, x2, y2));
     }
 
     String customCssText() const;
 
     double x1() const { return m_x1; }
@@ skipping 41 matching lines @@
     {
     }
 
     int m_steps;
     bool m_stepAtStart;
 };
 
 } // namespace
 
 #endif