--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/shared/CollectedHeap.java	2018-11-28 19:11:44.684705235 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/shared/CollectedHeap.java	2018-11-28 19:11:44.534706339 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -75,10 +75,6 @@
 
   public abstract CollectedHeapName kind();
 
-  public int cell_header_size() {
-    return 0;
-  }
-
   public String oopAddressDescription(OopHandle handle) {
       return handle.toString();
   }