Stop using void* types in the dart embedding api.

runtime/vm/port_test.cc

 // Copyright (c) 2011, 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/assert.h"
 #include "vm/message_queue.h"
 #include "vm/os.h"
 #include "vm/port.h"
 #include "vm/unit_test.h"
 
@@ skipping 165 matching lines @@
 
   // Check that the post message callback was called.
   EXPECT_STREQ("fail", saved_msg);
   PortMap::ClosePorts();
 }
 
 
 // End-of-test marker.
 static const intptr_t kEOT = 0xFFFF;
 
-void* AllocIntData(intptr_t payload) {
+Dart_Message AllocIntData(intptr_t payload) {
   intptr_t* result = reinterpret_cast<intptr_t*>(malloc(sizeof(payload)));
   *result = payload;
-  return result;
+  return reinterpret_cast<Dart_Message>(result);
 }
 
 
-intptr_t GetIntData(void* data) {
+intptr_t GetIntData(Dart_Message data) {
   return *reinterpret_cast<intptr_t*>(data);
 }
 
 
 static PortMessage* NextMessage() {
   Isolate* isolate = Isolate::Current();
   PortMessage* result = isolate->message_queue()->Dequeue(0);
   return result;
 }
 
@@ skipping 59 matching lines @@
   // Give the spawned thread enough time to properly exit.
   Monitor* waiter = new Monitor();
   {
     MonitorLocker ml(waiter);
     ml.Wait(20);
   }
   delete waiter;
 }
 
 }  // namespace dart