remove memoryinstrumentation

Source/core/rendering/style/DataRef.h

Index: Source/core/rendering/style/DataRef.h
diff --git a/Source/core/rendering/style/DataRef.h b/Source/core/rendering/style/DataRef.h
index cac898734941e822a01ea7e9a40c8dcd5265f74c..c8d8072cb9e9a8b3706de69ee8a47498e659927e 100644
--- a/Source/core/rendering/style/DataRef.h
+++ b/Source/core/rendering/style/DataRef.h
@@ -62,14 +62,6 @@ public:
         return m_data != o.m_data && *m_data != *o.m_data;
     }
 
-    // Template helps us to write the implementation without MemoryInstrumentation.h include.
-    template<typename MemoryObjectInfo>
-    void reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
-    {
-        typename MemoryObjectInfo::ClassInfo info(memoryObjectInfo, this);
-        info.addMember(m_data, "data");
-    }
-
 private:
     RefPtr<T> m_data;
 };