[wip] simplify -webkit-appearance adjust step

Source/core/css/resolver/CascadedValues.h

Index: Source/core/css/resolver/CascadedValues.h
diff --git a/Source/core/css/resolver/CascadedValues.h b/Source/core/css/resolver/CascadedValues.h
index a2e027f40580314db912640ffcaa618811a50403..c3bd18ac78e31752e3c203f6af151852411dad11 100644
--- a/Source/core/css/resolver/CascadedValues.h
+++ b/Source/core/css/resolver/CascadedValues.h
@@ -22,10 +22,14 @@ class StyleRule;
 class CascadedValues {
     STACK_ALLOCATED();
 public:
-    CascadedValues(StyleResolverState&, const MatchResult&, bool onlyAddUARules = false);
+    CascadedValues(StyleResolverState&, const MatchResult&);
     void applyValues(CSSPropertyID first, CSSPropertyID last, bool inheritedOnly = false);
 
+    bool valuesUnchangedForWebkitAppearance(const MatchResult&);
+
 private:
+    enum WebkitAppearanceConstructorType { WebkitAppearanceConstructor };
+    CascadedValues(StyleResolverState&, const MatchResult&, WebkitAppearanceConstructorType);
     void addMatchResult(const MatchResult&, CSSPropertyID firstId, CSSPropertyID lastId);
     void addMatchResultRange(const MatchResult&, bool isImportant, int firstIndex, int lastIndex, CSSPropertyID firstId, CSSPropertyID lastId);
     void addStylePropertySet(const StylePropertySet*, const StyleRule*, bool isImportant, CSSPropertyID first, CSSPropertyID last, PropertyWhitelistType, SelectorChecker::LinkMatchMask);