Revert VM thread cleanup

runtime/vm/service_isolate.cc

Index: runtime/vm/service_isolate.cc
diff --git a/runtime/vm/service_isolate.cc b/runtime/vm/service_isolate.cc
index f866f31ed987f49e8e5629c578dbda68128d379c..3779905093b7a5a401698fb608fec912ad4e4669 100644
--- a/runtime/vm/service_isolate.cc
+++ b/runtime/vm/service_isolate.cc
@@ -749,30 +749,8 @@ void ServiceIsolate::Run() {
 }
 
 
-void ServiceIsolate::KillServiceIsolate() {
-  {
-    MonitorLocker ml(monitor_);
-    shutting_down_ = true;
-  }
-  Isolate::KillIsolate(isolate_);
-  {
-    MonitorLocker ml(monitor_);
-    while (shutting_down_) {
-      ml.Wait();
-    }
-  }
-}
-
-
 void ServiceIsolate::Shutdown() {
   if (!IsRunning()) {
-    if (isolate_ != NULL) {
-      // TODO(johnmccutchan,turnidge) When it is possible to properly create
-      // the VMService object and set up its shutdown handler in the service
-      // isolate's main() function, this case will no longer be possible and
-      // can be removed.
-      KillServiceIsolate();
-    }
     return;
   }
   {