CSSValue Immediates: Change CSSValue to an object instead of a pointer

Source/core/css/parser/CSSParserFastPaths.h

Index: Source/core/css/parser/CSSParserFastPaths.h
diff --git a/Source/core/css/parser/CSSParserFastPaths.h b/Source/core/css/parser/CSSParserFastPaths.h
index b801812d13856669b90bf26032d0f11bcb8a20fa..efd337015cb2adec0e1dbd2068f07cfc2a915dc2 100644
--- a/Source/core/css/parser/CSSParserFastPaths.h
+++ b/Source/core/css/parser/CSSParserFastPaths.h
@@ -13,19 +13,19 @@
 
 namespace blink {
 
-class CSSValue;
+class NullableCSSValue;
 
 class CSSParserFastPaths {
 public:
     // Parses simple values like '10px' or 'green', but makes no guarantees
     // about handling any property completely.
-    static PassRefPtrWillBeRawPtr<CSSValue> maybeParseValue(CSSPropertyID, const String&, CSSParserMode);
+    static NullableCSSValue maybeParseValue(CSSPropertyID, const String&, CSSParserMode);
 
     // Properties handled here shouldn't be explicitly handled in CSSPropertyParser
     static bool isKeywordPropertyID(CSSPropertyID);
     static bool isValidKeywordPropertyAndValue(CSSPropertyID, CSSValueID);
 
-    static PassRefPtrWillBeRawPtr<CSSValue> parseColor(const String&, bool quirksMode);
+    static NullableCSSValue parseColor(const String&, bool quirksMode);
 };
 
 } // namespace blink