Remove superfluous CSSLinearTimingFunctionValue

Source/core/css/CSSValue.cpp

Index: Source/core/css/CSSValue.cpp
diff --git a/Source/core/css/CSSValue.cpp b/Source/core/css/CSSValue.cpp
index 0b0ba2830ba0fd116400883655c5b617a286e3b7..1ffc0b146d81f3b432032050e79381fe4a84ff2e 100644
--- a/Source/core/css/CSSValue.cpp
+++ b/Source/core/css/CSSValue.cpp
@@ -188,8 +188,6 @@ bool CSSValue::equals(const CSSValue& other) const
             return compareCSSValues<CSSReflectValue>(*this, other);
         case ShadowClass:
             return compareCSSValues<ShadowValue>(*this, other);
-        case LinearTimingFunctionClass:
-            return compareCSSValues<CSSLinearTimingFunctionValue>(*this, other);
         case CubicBezierTimingFunctionClass:
             return compareCSSValues<CSSCubicBezierTimingFunctionValue>(*this, other);
         case StepsTimingFunctionClass:
@@ -278,8 +276,6 @@ String CSSValue::cssText() const
         return static_cast<const CSSReflectValue*>(this)->customCssText();
     case ShadowClass:
         return static_cast<const ShadowValue*>(this)->customCssText();
-    case LinearTimingFunctionClass:
-        return static_cast<const CSSLinearTimingFunctionValue*>(this)->customCssText();
     case CubicBezierTimingFunctionClass:
         return static_cast<const CSSCubicBezierTimingFunctionValue*>(this)->customCssText();
     case StepsTimingFunctionClass:
@@ -397,9 +393,6 @@ void CSSValue::destroy()
     case ShadowClass:
         delete static_cast<ShadowValue*>(this);
         return;
-    case LinearTimingFunctionClass:
-        delete static_cast<CSSLinearTimingFunctionValue*>(this);
-        return;
     case CubicBezierTimingFunctionClass:
         delete static_cast<CSSCubicBezierTimingFunctionValue*>(this);
         return;