Pass around CSSSelector by reference instead of pointer

Source/core/dom/SelectorQuery.h

Index: Source/core/dom/SelectorQuery.h
diff --git a/Source/core/dom/SelectorQuery.h b/Source/core/dom/SelectorQuery.h
index a4b06877ae64ed798a249578b35d82ecfdcaec8a..528e68305f4ea56850c207196b14630f099ed06b 100644
--- a/Source/core/dom/SelectorQuery.h
+++ b/Source/core/dom/SelectorQuery.h
@@ -53,8 +53,8 @@ public:
 
 private:
     struct SelectorData {
-        SelectorData(const CSSSelector* selector, bool isFastCheckable) : selector(selector), isFastCheckable(isFastCheckable) { }
-        const CSSSelector* selector;
+        SelectorData(const CSSSelector& selector, bool isFastCheckable) : selector(selector), isFastCheckable(isFastCheckable) { }
+        const CSSSelector& selector;
         bool isFastCheckable;
     };
 
@@ -79,7 +79,7 @@ private:
     void executeSlow(ContainerNode& rootNode, typename SelectorQueryTrait::OutputType&) const;
     template <typename SelectorQueryTrait>
     void execute(ContainerNode& rootNode, typename SelectorQueryTrait::OutputType&) const;
-    const CSSSelector* selectorForIdLookup(const CSSSelector*) const;
+    const CSSSelector* selectorForIdLookup(const CSSSelector&) const;
 
     Vector<SelectorData> m_selectors;
 };