Introduce CSS_VALUE_TYPE_CASTS macro to cast CSSValue

Source/core/css/CSSValue.cpp

 /*
  * Copyright (C) 2011 Andreas Kling (kling@webkit.org)
  *
  * 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 370 matching lines @@
     case InitialClass:
         delete static_cast<CSSInitialValue*>(this);
         return;
     case GridTemplateClass:
         delete static_cast<CSSGridTemplateValue*>(this);
         return;
     case PrimitiveClass:
         delete toCSSPrimitiveValue(this);
         return;
     case ReflectClass:
-        delete static_cast<CSSReflectValue*>(this);
+        delete toCSSReflectValue(this);
         return;
     case ShadowClass:
         delete static_cast<ShadowValue*>(this);
         return;
     case CubicBezierTimingFunctionClass:
         delete static_cast<CSSCubicBezierTimingFunctionValue*>(this);
         return;
     case StepsTimingFunctionClass:
         delete static_cast<CSSStepsTimingFunctionValue*>(this);
         return;
     case UnicodeRangeClass:
         delete static_cast<CSSUnicodeRangeValue*>(this);
         return;
     case ValueListClass:
         delete toCSSValueList(this);
         return;
     case CSSTransformClass:
         delete static_cast<CSSTransformValue*>(this);
         return;
     case LineBoxContainClass:
         delete static_cast<CSSLineBoxContainValue*>(this);
         return;
     case CalculationClass:
         delete static_cast<CSSCalcValue*>(this);
         return;
     case ImageSetClass:
-        delete static_cast<CSSImageSetValue*>(this);
+        delete toCSSImageSetValue(this);
         return;
     case CSSFilterClass:
         delete static_cast<CSSFilterValue*>(this);
         return;
     case CSSArrayFunctionValueClass:
         delete static_cast<CSSArrayFunctionValue*>(this);
         return;
     case CSSMixFunctionValueClass:
         delete static_cast<CSSMixFunctionValue*>(this);
         return;
@@ skipping 40 matching lines @@
         return static_cast<const SVGColor*>(this)->cloneForCSSOM();
     case SVGPaintClass:
         return static_cast<const SVGPaint*>(this)->cloneForCSSOM();
     default:
         ASSERT(!isSubtypeExposedToCSSOM());
         return TextCloneCSSValue::create(classType(), cssText());
     }
 }
 
 }