RuleFeatures argument list cleanup.

Source/core/css/RuleFeature.h

Index: Source/core/css/RuleFeature.h
diff --git a/Source/core/css/RuleFeature.h b/Source/core/css/RuleFeature.h
index 31eabf94027de09968581107ec928315a2207d31..2e6a9b74842a82ea439df605d6fbc39ba6ed8ec9 100644
--- a/Source/core/css/RuleFeature.h
+++ b/Source/core/css/RuleFeature.h
@@ -144,8 +144,17 @@ private:
     DescendantInvalidationSet* invalidationSetForSelector(const CSSSelector&);
 
     InvalidationSetMode updateInvalidationSets(const CSSSelector&);
-    const CSSSelector* extractInvalidationSetFeatures(const CSSSelector&, Vector<AtomicString>& classes, AtomicString& id, AtomicString& tagName, Vector<AtomicString>& attributes);
-    void addFeaturesToInvalidationSets(const CSSSelector&, const Vector<AtomicString>& classes, AtomicString id, AtomicString tagName, const Vector<AtomicString>& attributes);
+
+    struct InvalidationSetFeatures {
+        Vector<AtomicString> classes;
+        Vector<AtomicString> attributes;
+        AtomicString id;
+        AtomicString tagName;
+    };
+
+    static void extractInvalidationSetFeature(const CSSSelector&, InvalidationSetFeatures&);
+    const CSSSelector* extractInvalidationSetFeatures(const CSSSelector&, InvalidationSetFeatures&);
+    void addFeaturesToInvalidationSets(const CSSSelector&, const InvalidationSetFeatures&);
 
     void addClassToInvalidationSet(const AtomicString& className, Element*);