VM restart + shutdown fixes

runtime/vm/native_message_handler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/native_message_handler.h"
 
 #include "vm/dart_api_message.h"
 #include "vm/isolate.h"
 #include "vm/message.h"
 #include "vm/snapshot.h"
@@ skipping 14 matching lines @@
 }
 
 
 #if defined(DEBUG)
 void NativeMessageHandler::CheckAccess() {
   ASSERT(Isolate::Current() == NULL);
 }
 #endif
 
 
-bool NativeMessageHandler::HandleMessage(Message* message) {
+MessageHandler::MessageStatus NativeMessageHandler::HandleMessage(
+    Message* message) {
   if (message->IsOOB()) {
     // We currently do not use OOB messages for native ports.
     UNREACHABLE();
   }
   // We create a native scope for handling the message.
   // All allocation of objects for decoding the message is done in the
   // zone associated with this scope.
   ApiNativeScope scope;
   ApiMessageReader reader(message->data(), message->len());
   Dart_CObject* object = reader.ReadMessage();
   (*func())(message->dest_port(), object);
   delete message;
-  return true;
+  return kOK;
 }
 
 }  // namespace dart