remove HTMLAnchorElement::PrefetchEventHandler

Source/core/html/HTMLAnchorElement.h

Index: Source/core/html/HTMLAnchorElement.h
diff --git a/Source/core/html/HTMLAnchorElement.h b/Source/core/html/HTMLAnchorElement.h
index 769c6d2a0eafdef5d553131171bd86ff38fe67fd..6178b33803c9c586c988adbc494605fd73317092 100644
--- a/Source/core/html/HTMLAnchorElement.h
+++ b/Source/core/html/HTMLAnchorElement.h
@@ -82,8 +82,6 @@ public:
     LinkHash visitedLinkHash() const;
     void invalidateCachedVisitedLinkHash() { m_cachedVisitedLinkHash = 0; }
 
-    virtual void trace(Visitor*) OVERRIDE;
-
 protected:
     HTMLAnchorElement(const QualifiedName&, Document&);
 
@@ -107,11 +105,7 @@ private:
     AtomicString target() const;
     void handleClick(Event*);
 
-    class PrefetchEventHandler;
-    PrefetchEventHandler* prefetchEventHandler();
-
     uint32_t m_linkRelations;
-    OwnPtrWillBeMember<PrefetchEventHandler> m_prefetchEventHandler;
     mutable LinkHash m_cachedVisitedLinkHash;
 };