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

runtime/vm/dart.cc

Index: runtime/vm/dart.cc
diff --git a/runtime/vm/dart.cc b/runtime/vm/dart.cc
index e9c578a9d99d97301250818aa13e5dc7301c7e16..0fd5fa7107ab09f8c749cd5202023ed1042bcf4e 100644
--- a/runtime/vm/dart.cc
+++ b/runtime/vm/dart.cc
@@ -398,6 +398,17 @@ void Dart::RunShutdownCallback() {
 }
 
 
+void Dart::ShutdownIsolate(Isolate* isolate) {
+  ASSERT(Isolate::Current() == NULL);
+  // We need to enter the isolate in order to shut it down.
+  Thread::EnterIsolate(isolate);
+  ShutdownIsolate();
+  // Since the isolate is shutdown and deleted, there is no need to
+  // exit the isolate here.
+  ASSERT(Isolate::Current() == NULL);
+}
+
+
 void Dart::ShutdownIsolate() {
   Isolate* isolate = Isolate::Current();
   isolate->Shutdown();