SendPort + ReceivePort changes:

lib/isolate/frog/messages.dart

Index: lib/isolate/frog/messages.dart
diff --git a/lib/isolate/frog/messages.dart b/lib/isolate/frog/messages.dart
index e5d36b26b46d3f27e6f368dbea5ee2b69b741a1d..0e435143e0abf3a3c4406ee2dee55191b7b26e58 100644
--- a/lib/isolate/frog/messages.dart
+++ b/lib/isolate/frog/messages.dart
@@ -70,8 +70,6 @@ class _MessageTraverser {
     if (x is _NativeJsSendPort) return visitNativeJsSendPort(x);
     if (x is _WorkerSendPort) return visitWorkerSendPort(x);
     if (x is _BufferingSendPort) return visitBufferingSendPort(x);
-    if (x is _ReceivePortImpl) return visitReceivePort(x);
-    if (x is _ReceivePortSingleShotImpl) return visitReceivePortSingleShot(x);
     // TODO(floitsch): make this a real exception. (which one)?
     throw "Message serialization: Illegal value $x passed";
   }
@@ -82,8 +80,6 @@ class _MessageTraverser {
   abstract visitNativeJsSendPort(_NativeJsSendPort x);
   abstract visitWorkerSendPort(_WorkerSendPort x);
   abstract visitBufferingSendPort(_BufferingSendPort x);
-  abstract visitReceivePort(_ReceivePortImpl x);
-  abstract visitReceivePortSingleShot(_ReceivePortSingleShotImpl x);
 
   _clearAttachedInfo(var o) native
       "o['__MessageTraverser__attached_info__'] = (void 0);";
@@ -158,14 +154,6 @@ class _Copier extends _MessageTraverser {
           + " ports are resolved at this point.";
     }
   }
-
-  SendPort visitReceivePort(_ReceivePortImpl port) {
-    return port.toSendPort();
-  }
-
-  SendPort visitReceivePortSingleShot(_ReceivePortSingleShotImpl port) {
-    return port.toSendPort();
-  }
 }
 
 /** Visitor that serializes a message as a JSON array. */
@@ -218,14 +206,6 @@ class _Serializer extends _MessageTraverser {
     }
   }
 
-  visitReceivePort(_ReceivePortImpl port) {
-    return visitNativeJsSendPort(port.toSendPort());;
-  }
-
-  visitReceivePortSingleShot(_ReceivePortSingleShotImpl port) {
-    return visitNativeJsSendPort(port.toSendPort());
-  }
-
   _serializeList(List list) {
     int len = list.length;
     var result = new List(len);