1. Get rid of SwitchIsolateScope as it is not clear when this should be used and there is also a bu…

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 5bcd7cb6ee8ef80a9203ce3df36ab13f6cff4b2b..923f6d4c43e65bca1d8e6fe09d7988606e95a499 100644
--- a/runtime/vm/service_isolate.cc
+++ b/runtime/vm/service_isolate.cc
@@ -360,11 +360,8 @@ class RunServiceTask : public ThreadPool::Task {
       }
       Dart::RunShutdownCallback();
     }
-    {
-      // Shut the isolate down.
-      SwitchIsolateScope switch_scope(I);
-      Dart::ShutdownIsolate();
-    }
+    // Shut the isolate down.
+    Dart::ShutdownIsolate(I);
     if (FLAG_trace_service) {
       OS::Print("vm-service: Shutdown.\n");
     }