Simplify parseShadowValue

Source/core/css/parser/CSSPropertyParser.h

Index: Source/core/css/parser/CSSPropertyParser.h
diff --git a/Source/core/css/parser/CSSPropertyParser.h b/Source/core/css/parser/CSSPropertyParser.h
index 09d58231b296046b555a6546cd167bb86d586b97..c4ec195c72c03647d77b8f36418d0f4d3c63cf4c 100644
--- a/Source/core/css/parser/CSSPropertyParser.h
+++ b/Source/core/css/parser/CSSPropertyParser.h
@@ -43,6 +43,7 @@ class CSSParserValueList;
 class CSSPrimitiveValue;
 class CSSProperty;
 class CSSQuadValue;
+class CSSShadowValue;
 class CSSValue;
 class CSSValueList;
 class StylePropertyShorthand;
@@ -209,6 +210,7 @@ private:
 
     // CSS3 Parsing Routines (for properties specific to CSS3)
     PassRefPtrWillBeRawPtr<CSSValueList> parseShadow(CSSParserValueList*, CSSPropertyID);
+    PassRefPtrWillBeRawPtr<CSSShadowValue> parseSingleShadow(CSSParserValueList*, bool allowInset, bool allowSpread);
     bool parseBorderImageShorthand(CSSPropertyID, bool important);
     PassRefPtrWillBeRawPtr<CSSValue> parseBorderImage(CSSPropertyID);
     bool parseBorderImageRepeat(RefPtrWillBeRawPtr<CSSValue>&);