Remove CSS clients of ImageResource

sky/engine/core/css/parser/CSSPropertyParser.h

Index: sky/engine/core/css/parser/CSSPropertyParser.h
diff --git a/sky/engine/core/css/parser/CSSPropertyParser.h b/sky/engine/core/css/parser/CSSPropertyParser.h
index a996f7bac9c1000ef18c7f5443a42ee6db18316e..3454a2298d83f11585bbd94011d7367ffec6bba2 100644
--- a/sky/engine/core/css/parser/CSSPropertyParser.h
+++ b/sky/engine/core/css/parser/CSSPropertyParser.h
@@ -180,10 +180,6 @@ private:
     bool parseRadialGradient(CSSParserValueList*, RefPtr<CSSValue>&, CSSGradientRepeat repeating);
     bool parseGradientColorStops(CSSParserValueList*, CSSGradientValue*, bool expectComma);
 
-    bool parseCrossfade(CSSParserValueList*, RefPtr<CSSValue>&);
-
-    PassRefPtr<CSSValue> parseImageSet(CSSParserValueList*);
-
     PassRefPtr<CSSValue> parseWillChange();
 
     PassRefPtr<CSSValueList> parseFilter();
@@ -216,8 +212,6 @@ private:
     PassRefPtr<CSSPrimitiveValue> createPrimitiveNumericValue(CSSParserValue*);
     PassRefPtr<CSSPrimitiveValue> createPrimitiveStringValue(CSSParserValue*);
 
-    PassRefPtr<CSSValue> createCSSImageValueWithReferrer(const String& rawValue, const KURL&);
-
     bool validWidthOrHeight(CSSParserValue*);
 
     PassRefPtr<CSSBasicShape> parseInsetRoundedCorners(PassRefPtr<CSSBasicShapeInset>, CSSParserValueList*);