--- old/src/share/vm/classfile/systemDictionary.hpp	2019-01-28 17:43:26.000000000 +0800
+++ new/src/share/vm/classfile/systemDictionary.hpp	2019-01-28 17:43:26.000000000 +0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2019, 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
@@ -77,7 +77,6 @@
 template <MEMFLAGS F> class HashtableBucket;
 class ResolutionErrorTable;
 class SymbolPropertyTable;
-class Ticks;
 
 // Certain classes are preloaded, such as java.lang.Object and java.lang.String.
 // They are all "well-known", in the sense that no class loader is allowed