diff -r 64ca9fbcf85f -r fa727a4d7934 src/hotspot/share/gc/g1/g1StringDedupThread.hpp
--- a/src/hotspot/share/gc/g1/g1StringDedupThread.hpp	Thu Jun 14 15:27:49 2018 -0700
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,60 +0,0 @@
-/*
- * Copyright (c) 2014, 2016, 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
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- *
- */
-
-#ifndef SHARE_VM_GC_G1_G1STRINGDEDUPTHREAD_HPP
-#define SHARE_VM_GC_G1_G1STRINGDEDUPTHREAD_HPP
-
-#include "gc/g1/g1StringDedupStat.hpp"
-#include "gc/shared/concurrentGCThread.hpp"
-
-//
-// The deduplication thread is where the actual deduplication occurs. It waits for
-// deduplication candidates to appear on the deduplication queue, removes them from
-// the queue and tries to deduplicate them. It uses the deduplication hashtable to
-// find identical, already existing, character arrays on the heap. The thread runs
-// concurrently with the Java application but participates in safepoints to allow
-// the GC to adjust and unlink oops from the deduplication queue and table.
-//
-class G1StringDedupThread: public ConcurrentGCThread {
-private:
-  static G1StringDedupThread* _thread;
-
-  G1StringDedupThread();
-  ~G1StringDedupThread();
-
-  void print_start(const G1StringDedupStat& last_stat);
-  void print_end(const G1StringDedupStat& last_stat, const G1StringDedupStat& total_stat);
-
-  void run_service();
-  void stop_service();
-
-public:
-  static void create();
-
-  static G1StringDedupThread* thread();
-
-  void deduplicate_shared_strings(G1StringDedupStat& stat);
-};
-
-#endif // SHARE_VM_GC_G1_G1STRINGDEDUPTHREAD_HPP