--- a/src/hotspot/share/runtime/mutexLocker.cpp	Wed Oct 03 23:00:32 2018 -0700
+++ b/src/hotspot/share/runtime/mutexLocker.cpp	Mon Oct 15 14:16:35 2018 -0700
@@ -133,8 +133,6 @@
 Monitor* PeriodicTask_lock            = NULL;
 Monitor* RedefineClasses_lock         = NULL;
 
-Mutex*   ThreadHeapSampler_lock       = NULL;
-
 #if INCLUDE_JFR
 Mutex*   JfrStacktrace_lock           = NULL;
 Monitor* JfrMsg_lock                  = NULL;
@@ -301,8 +299,6 @@
   def(PeriodicTask_lock            , PaddedMonitor, nonleaf+5,   true,  Monitor::_safepoint_check_sometimes);
   def(RedefineClasses_lock         , PaddedMonitor, nonleaf+5,   true,  Monitor::_safepoint_check_always);
 
-  def(ThreadHeapSampler_lock       , PaddedMutex,   nonleaf,     false, Monitor::_safepoint_check_never);
-
   if (WhiteBoxAPI) {
     def(Compilation_lock           , PaddedMonitor, leaf,        false, Monitor::_safepoint_check_never);
   }