diff -r c036b84c6bbf -r 758deedaae84 src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp
--- a/src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp	Wed May 09 11:24:12 2018 +0200
+++ b/src/hotspot/share/gc/cms/concurrentMarkSweepGeneration.cpp	Wed May 09 13:37:05 2018 +0200
@@ -5062,22 +5062,6 @@
   assert(_collector->_overflow_list == NULL, "non-empty _overflow_list");
 }
 
-class CMSRefEnqueueTaskProxy: public AbstractGangTask {
-  typedef AbstractRefProcTaskExecutor::EnqueueTask EnqueueTask;
-  EnqueueTask& _task;
-
-public:
-  CMSRefEnqueueTaskProxy(EnqueueTask& task)
-    : AbstractGangTask("Enqueue reference objects in parallel"),
-      _task(task)
-  { }
-
-  virtual void work(uint worker_id)
-  {
-    _task.work(worker_id);
-  }
-};
-
 CMSParKeepAliveClosure::CMSParKeepAliveClosure(CMSCollector* collector,
   MemRegion span, CMSBitMap* bit_map, OopTaskQueue* work_queue):
    _span(span),
@@ -5147,16 +5131,6 @@
   workers->run_task(&rp_task);
 }
 
-void CMSRefProcTaskExecutor::execute(EnqueueTask& task)
-{
-
-  CMSHeap* heap = CMSHeap::heap();
-  WorkGang* workers = heap->workers();
-  assert(workers != NULL, "Need parallel worker threads.");
-  CMSRefEnqueueTaskProxy enq_task(task);
-  workers->run_task(&enq_task);
-}
-
 void CMSCollector::refProcessingWork() {
   ResourceMark rm;
   HandleMark   hm;