Pass around CSSSelector by reference instead of pointer

Source/core/css/RuleFeature.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 35 matching lines @@
     bool hasDocumentSecurityOrigin;
 };
 
 class RuleFeatureSet {
 public:
     RuleFeatureSet() { }
 
     void add(const RuleFeatureSet&);
     void clear();
 
-    void collectFeaturesFromSelector(const CSSSelector*);
+    void collectFeaturesFromSelector(const CSSSelector&);
     void collectFeaturesFromRuleData(const RuleData&);
 
     bool usesSiblingRules() const { return !siblingRules.isEmpty(); }
     bool usesFirstLineRules() const { return m_metadata.usesFirstLineRules; }
 
     unsigned maxDirectAdjacentSelectors() const { return m_metadata.maxDirectAdjacentSelectors; }
     void setMaxDirectAdjacentSelectors(unsigned value)  { m_metadata.maxDirectAdjacentSelectors = std::max(value, m_metadata.maxDirectAdjacentSelectors); }
 
     inline bool hasSelectorForAttribute(const AtomicString& attributeName) const
     {
@@ skipping 36 matching lines @@
         void clear();
 
         bool usesFirstLineRules;
         bool foundSiblingSelector;
         unsigned maxDirectAdjacentSelectors;
         HashSet<AtomicString> idsInRules;
         HashSet<AtomicString> classesInRules;
         HashSet<AtomicString> attrsInRules;
     };
 
-    void collectFeaturesFromSelector(const CSSSelector*, FeatureMetadata&);
+    void collectFeaturesFromSelector(const CSSSelector&, FeatureMetadata&);
     void collectFeaturesFromSelectorList(const CSSSelectorList*, FeatureMetadata&);
     DescendantInvalidationSet& ensureClassInvalidationSet(const AtomicString& className);
-    bool updateClassInvalidationSets(const CSSSelector*);
+    bool updateClassInvalidationSets(const CSSSelector&);
 
     InvalidationSetMap m_classInvalidationSets;
     FeatureMetadata m_metadata;
 };
 
 } // namespace WebCore
 
 #endif // RuleFeature_h