Wait for eventhandler to shut down before exiting

dart/runtime/bin/eventhandler_linux.cc

Index: dart/runtime/bin/eventhandler_linux.cc
diff --git a/dart/runtime/bin/eventhandler_linux.cc b/dart/runtime/bin/eventhandler_linux.cc
index 97b305b61e39d05aff432978f25ef07cf846879a..ba1d88862e68f87a76c9a4b650e051a8f6be0b33 100644
--- a/dart/runtime/bin/eventhandler_linux.cc
+++ b/dart/runtime/bin/eventhandler_linux.cc
@@ -315,6 +315,7 @@ void EventHandlerImplementation::Poll(uword args) {
   EventHandler* handler = reinterpret_cast<EventHandler*>(args);
   EventHandlerImplementation* handler_impl = &handler->delegate_;
   ASSERT(handler_impl != NULL);
+
   while (!handler_impl->shutdown_) {
     intptr_t result = TEMP_FAILURE_RETRY_NO_SIGNAL_BLOCKER(
         epoll_wait(handler_impl->epoll_fd_, events, kMaxEvents, -1));
@@ -327,13 +328,13 @@ void EventHandlerImplementation::Poll(uword args) {
       handler_impl->HandleEvents(events, result);
     }
   }
-  delete handler;
+  handler->NotifyShutdownDone();
 }
 
 
 void EventHandlerImplementation::Start(EventHandler* handler) {
   int result = Thread::Start(&EventHandlerImplementation::Poll,
-                                   reinterpret_cast<uword>(handler));
+                             reinterpret_cast<uword>(handler));
   if (result != 0) {
     FATAL1("Failed to start event handler thread %d", result);
   }