--- old/src/hotspot/share/gc/shared/referenceProcessor.hpp	2017-09-22 13:33:02.573862820 -0700
+++ new/src/hotspot/share/gc/shared/referenceProcessor.hpp	2017-09-22 13:33:02.229863954 -0700
@@ -252,8 +252,7 @@
 
   size_t process_phaseHeapSampling(BoolObjectClosure* is_alive,
                                    OopClosure*        keep_alive,
-                                   VoidClosure*       complete_gc,
-                                   AbstractRefProcTaskExecutor* task_executor);
+                                   VoidClosure*       complete_gc);
 
   // Work methods used by the method process_discovered_reflist
   // Phase1: keep alive all those referents that are otherwise