Dart: Use a RawReceivePort to receive events for Mojo handles.

mojo/public/dart/mojo/lib/src/handle.dart

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 part of core;
 
 
 class MojoHandle {
   static const int INVALID = 0;
   static const int DEADLINE_INDEFINITE = -1;
@@ skipping 63 matching lines @@
 
   static MojoWaitManyResult waitMany(
       List<int> handles, List<int> signals, int deadline) {
     List result = MojoHandleNatives.waitMany(handles, signals, deadline);
     List states = result[2] != null
         ? result[2].map((l) => new MojoHandleSignalsState(l[0], l[1])).toList()
         : null;
     return new MojoWaitManyResult(new MojoResult(result[0]), result[1], states);
   }
 
-  static MojoResult registerFinalizer(MojoEventStream eventStream) {
+  static MojoResult registerFinalizer(MojoEventHandler eventHandler) {
     return new MojoResult(MojoHandleNatives.registerFinalizer(
-        eventStream, eventStream._handle.h));
+        eventHandler, eventHandler._handle.h));
   }
 
   static bool reportLeakedHandles() => MojoHandleNatives.reportOpenHandles();
 }