VM restart + shutdown fixes

runtime/vm/port_test.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 "platform/assert.h"
 #include "vm/lockers.h"
 #include "vm/message_handler.h"
 #include "vm/os.h"
 #include "vm/port.h"
 #include "vm/unit_test.h"
@@ skipping 20 matching lines @@
 
 
 class PortTestMessageHandler : public MessageHandler {
  public:
   PortTestMessageHandler() : notify_count(0) {}
 
   void MessageNotify(Message::Priority priority) {
     notify_count++;
   }
 
-  bool HandleMessage(Message* message) { return true; }
+  MessageStatus HandleMessage(Message* message) { return kOK; }
 
   int notify_count;
 };
 
 
 TEST_CASE(PortMap_CreateAndCloseOnePort) {
   PortTestMessageHandler handler;
   Dart_Port port = PortMap::CreatePort(&handler);
   EXPECT_NE(0, port);
   EXPECT(PortMapTestPeer::IsActivePort(port));
@@ skipping 107 matching lines @@
 
   const char* message = "msg";
   intptr_t message_len = strlen(message) + 1;
 
   EXPECT(!PortMap::PostMessage(new Message(
       port, reinterpret_cast<uint8_t*>(strdup(message)), message_len,
       Message::kNormalPriority)));
 }
 
 }  // namespace dart