Generate toCSSFooValue for CSS*GradientValues

Source/core/css/CSSParser-in.cpp

Index: Source/core/css/CSSParser-in.cpp
diff --git a/Source/core/css/CSSParser-in.cpp b/Source/core/css/CSSParser-in.cpp
index 118d8a13700a84a364088d7d9f0da47f3a4a4383..54cdebd3daa3b22ff8482cc6cc4f545f789506d9 100644
--- a/Source/core/css/CSSParser-in.cpp
+++ b/Source/core/css/CSSParser-in.cpp
@@ -7395,7 +7395,7 @@ bool CSSParser::parseDeprecatedGradient(CSSParserValueList* valueList, RefPtr<CS
         a = args->next();
         if (!a || a->unit != CSSPrimitiveValue::CSS_NUMBER)
             return false;
-        static_cast<CSSRadialGradientValue*>(result.get())->setFirstRadius(createPrimitiveNumericValue(a));
+        toCSSRadialGradientValue(result.get())->setFirstRadius(createPrimitiveNumericValue(a));
 
         // Comma after the first radius.
         a = args->next();
@@ -7432,7 +7432,7 @@ bool CSSParser::parseDeprecatedGradient(CSSParserValueList* valueList, RefPtr<CS
         a = args->next();
         if (!a || a->unit != CSSPrimitiveValue::CSS_NUMBER)
             return false;
-        static_cast<CSSRadialGradientValue*>(result.get())->setSecondRadius(createPrimitiveNumericValue(a));
+        toCSSRadialGradientValue(result.get())->setSecondRadius(createPrimitiveNumericValue(a));
     }
 
     // We now will accept any number of stops (0 or more).