Revert "Avoid to run dart code during paused_on_exit"

runtime/vm/message_handler.cc

Index: runtime/vm/message_handler.cc
diff --git a/runtime/vm/message_handler.cc b/runtime/vm/message_handler.cc
index a6d7da81957f28f95736193f94e93155ea721c51..3990b5795a8a93ef441b521adfebdfe4ac35694f 100644
--- a/runtime/vm/message_handler.cc
+++ b/runtime/vm/message_handler.cc
@@ -346,18 +346,7 @@ void MessageHandler::TaskCallback() {
         PausedOnStartLocked(&ml, false);
       }
     }
-    if (is_paused_on_exit()) {
-      status = HandleMessages(&ml, false, false);
-      if (ShouldPauseOnExit(status)) {
-        // Still paused.
-        ASSERT(oob_queue_->IsEmpty());
-        task_ = NULL;  // No task in queue.
-        return;
-      } else {
-        PausedOnExitLocked(&ml, false);
-      }
-    }
-#endif  // !defined(PRODUCT)
+#endif
 
     if (status == kOK) {
       if (start_callback_) {
@@ -384,15 +373,17 @@ void MessageHandler::TaskCallback() {
     if (status != kOK || !HasLivePorts()) {
 #if !defined(PRODUCT)
       if (ShouldPauseOnExit(status)) {
-        if (FLAG_trace_service_pause_events) {
-          OS::PrintErr(
-              "Isolate %s paused before exiting. "
-              "Use the Observatory to release it.\n",
-              name());
+        if (!is_paused_on_exit()) {
+          if (FLAG_trace_service_pause_events) {
+            OS::PrintErr(
+                "Isolate %s paused before exiting. "
+                "Use the Observatory to release it.\n",
+                name());
+          }
+          PausedOnExitLocked(&ml, true);
+          // More messages may have come in while we released the monitor.
+          status = HandleMessages(&ml, false, false);
         }
-        PausedOnExitLocked(&ml, true);
-        // More messages may have come in while we released the monitor.
-        status = HandleMessages(&ml, false, false);
         if (ShouldPauseOnExit(status)) {
           // Still paused.
           ASSERT(oob_queue_->IsEmpty());