Remove superfluous CSSLinearTimingFunctionValue

Source/core/css/CSSTimingFunctionValue.cpp

 /*
  * Copyright (C) 2007 Apple Computer, 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 12 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/css/CSSTimingFunctionValue.h"
 
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
-String CSSLinearTimingFunctionValue::customCssText() const
-{
-    return "linear";
-}
-
 String CSSCubicBezierTimingFunctionValue::customCssText() const
 {
     return "cubic-bezier("
         + String::number(m_x1) + ", "
         + String::number(m_y1) + ", "
         + String::number(m_x2) + ", "
         + String::number(m_y2) + ")";
 }
 
 bool CSSCubicBezierTimingFunctionValue::equals(const CSSCubicBezierTimingFunctionValue& other) const
 {
     return m_x1 == other.m_x1 && m_x2 == other.m_x2 && m_y1 == other.m_y1 && m_y2 == other.m_y2;
 }
 
 String CSSStepsTimingFunctionValue::customCssText() const
 {
     return "steps(" + String::number(m_steps) + ", " + (m_stepAtStart ? "start" : "end") + ')';
 }
 
 bool CSSStepsTimingFunctionValue::equals(const CSSStepsTimingFunctionValue& other) const
 {
     return m_steps == other.m_steps && m_stepAtStart == other.m_stepAtStart;
 }
 
 } // namespace WebCore