Use DEFINE_CSS_VALUE_TYPE_CASTS instead of using manual type cast function for CSSShaderValue

Source/core/css/CSSValue.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 75 matching lines @@
     bool isReflectValue() const { return m_classType == ReflectClass; }
     bool isShadowValue() const { return m_classType == ShadowClass; }
     bool isCubicBezierTimingFunctionValue() const { return m_classType == CubicBezierTimingFunctionClass; }
     bool isStepsTimingFunctionValue() const { return m_classType == StepsTimingFunctionClass; }
     bool isCSSTransformValue() const { return m_classType == CSSTransformClass; }
     bool isCSSLineBoxContainValue() const { return m_classType == LineBoxContainClass; }
     bool isCalcValue() const {return m_classType == CalculationClass; }
     bool isCSSFilterValue() const { return m_classType == CSSFilterClass; }
     bool isCSSArrayFunctionValue() const { return m_classType == CSSArrayFunctionValueClass; }
     bool isCSSMixFunctionValue() const { return m_classType == CSSMixFunctionValueClass; }
-    bool isCSSShaderValue() const { return m_classType == CSSShaderClass; }
+    bool isShaderValue() const { return m_classType == CSSShaderClass; }
     bool isVariableValue() const { return m_classType == VariableClass; }
     bool isGridTemplateValue() const { return m_classType == GridTemplateClass; }
     bool isSVGColor() const { return m_classType == SVGColorClass || m_classType == SVGPaintClass; }
     bool isSVGPaint() const { return m_classType == SVGPaintClass; }
     bool isCSSSVGDocumentValue() const { return m_classType == CSSSVGDocumentClass; }
 
     bool isCSSOMSafe() const { return m_isCSSOMSafe; }
     bool isSubtypeExposedToCSSOM() const
     {
         return isPrimitiveValue() || isSVGColor() || isValueList();
@@ skipping 140 matching lines @@
 { \
     ASSERT_WITH_SECURITY_IMPLICATION(!value || value->is##ValueTypeName()); \
     return static_cast<CSS##ValueTypeName*>(value); \
 } \
 void toCSS##ValueTypeName(const CSS##ValueTypeName*); \
 void toCSS##ValueTypeName(const CSS##ValueTypeName&)
 
 } // namespace WebCore
 
 #endif // CSSValue_h