Add toSVGColor|Paint() to cleanup static_cast<>, and use it

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 285 matching lines @@
         return toCSSFilterValue(this)->customCssText();
     case CSSArrayFunctionValueClass:
         return toCSSArrayFunctionValue(this)->customCssText();
     case CSSMixFunctionValueClass:
         return toCSSMixFunctionValue(this)->customCssText();
     case CSSShaderClass:
         return toCSSShaderValue(this)->customCssText();
     case VariableClass:
         return toCSSVariableValue(this)->value();
     case SVGColorClass:
-        return static_cast<const SVGColor*>(this)->customCssText();
+        return toSVGColor(this)->customCssText();
     case SVGPaintClass:
-        return static_cast<const SVGPaint*>(this)->customCssText();
+        return toSVGPaint(this)->customCssText();
     case CSSSVGDocumentClass:
         return toCSSSVGDocumentValue(this)->customCssText();
     }
     ASSERT_NOT_REACHED();
     return String();
 }
 
 String CSSValue::serializeResolvingVariables(const HashMap<AtomicString, String>& variables) const
 {
     switch (classType()) {
@@ skipping 107 matching lines @@
     case CSSMixFunctionValueClass:
         delete toCSSMixFunctionValue(this);
         return;
     case CSSShaderClass:
         delete toCSSShaderValue(this);
         return;
     case VariableClass:
         delete toCSSVariableValue(this);
         return;
     case SVGColorClass:
-        delete static_cast<SVGColor*>(this);
+        delete toSVGColor(this);
         return;
     case SVGPaintClass:
-        delete static_cast<SVGPaint*>(this);
+        delete toSVGPaint(this);
         return;
     case CSSSVGDocumentClass:
         delete toCSSSVGDocumentValue(this);
         return;
     }
     ASSERT_NOT_REACHED();
 }
 
 PassRefPtr<CSSValue> CSSValue::cloneForCSSOM() const
 {
     switch (classType()) {
     case PrimitiveClass:
         return toCSSPrimitiveValue(this)->cloneForCSSOM();
     case ValueListClass:
         return toCSSValueList(this)->cloneForCSSOM();
     case ImageClass:
     case CursorImageClass:
         return toCSSImageValue(this)->cloneForCSSOM();
     case CSSFilterClass:
         return toCSSFilterValue(this)->cloneForCSSOM();
     case CSSArrayFunctionValueClass:
         return toCSSArrayFunctionValue(this)->cloneForCSSOM();
     case CSSMixFunctionValueClass:
         return toCSSMixFunctionValue(this)->cloneForCSSOM();
     case CSSTransformClass:
         return toCSSTransformValue(this)->cloneForCSSOM();
     case ImageSetClass:
         return toCSSImageSetValue(this)->cloneForCSSOM();
     case SVGColorClass:
-        return static_cast<const SVGColor*>(this)->cloneForCSSOM();
+        return toSVGColor(this)->cloneForCSSOM();
     case SVGPaintClass:
-        return static_cast<const SVGPaint*>(this)->cloneForCSSOM();
+        return toSVGPaint(this)->cloneForCSSOM();
     default:
         ASSERT(!isSubtypeExposedToCSSOM());
         return TextCloneCSSValue::create(classType(), cssText());
     }
 }
 
 }