Remove RetainPtrObjectHash and RetainPtrObjectHashTraits

Source/wtf/RetainPtr.h

Index: Source/wtf/RetainPtr.h
diff --git a/Source/wtf/RetainPtr.h b/Source/wtf/RetainPtr.h
index 9981a4d988a8a35d4f93dd226b959ec0bbe576c2..09ead690cea597b81ce29dc5c02d6780b7e80163 100644
--- a/Source/wtf/RetainPtr.h
+++ b/Source/wtf/RetainPtr.h
@@ -294,35 +294,8 @@ namespace WTF {
         static bool equal(typename RetainPtr<P>::PtrType a, const RetainPtr<P>& b) { return a == b; }
         static bool equal(const RetainPtr<P>& a, typename RetainPtr<P>::PtrType b) { return a == b; }
     };
-    
-    template<typename P> struct DefaultHash<RetainPtr<P> > { typedef PtrHash<RetainPtr<P> > Hash; };
-
-    template <typename P>
-    struct RetainPtrObjectHashTraits : GenericHashTraits<RetainPtr<P> > {
-        static const bool emptyValueIsZero = true;
-        static const RetainPtr<P>& emptyValue()
-        {
-            static RetainPtr<P>& null = *(new RetainPtr<P>);
-            return null;
-        }
-        static const bool needsDestruction = true;
-        static void constructDeletedValue(RetainPtr<P>& slot) { new (&slot) RetainPtr<P>(HashTableDeletedValue); }
-        static bool isDeletedValue(const RetainPtr<P>& value) { return value.isHashTableDeletedValue(); }
-    };
 
-    template <typename P>
-    struct RetainPtrObjectHash {
-        static unsigned hash(const RetainPtr<P>& o)
-        {
-            ASSERT_WITH_MESSAGE(o.get(), "attempt to use null RetainPtr in HashTable");
-            return CFHash(o.get());
-        }
-        static bool equal(const RetainPtr<P>& a, const RetainPtr<P>& b)
-        {
-            return CFEqual(a.get(), b.get());
-        }
-        static const bool safeToCompareToEmptyOrDeleted = false;
-    };
+    template<typename P> struct DefaultHash<RetainPtr<P> > { typedef PtrHash<RetainPtr<P> > Hash; };
 } // namespace WTF
 
 using WTF::AdoptCF;