VM: [Kernel] Revert changes to the native ports that introduced peers.

runtime/bin/io_service.cc

Index: runtime/bin/io_service.cc
diff --git a/runtime/bin/io_service.cc b/runtime/bin/io_service.cc
index 121c978c5eac9d0c874b5537fb3b12483ece33dd..2a685f1d6ad233abc7a97a3f49e442a4908a5481 100644
--- a/runtime/bin/io_service.cc
+++ b/runtime/bin/io_service.cc
@@ -27,9 +27,7 @@ namespace bin {
     response = type::method##Request(data);                                    \
     break;
 
-void IOServiceCallback(Dart_Port dest_port_id,
-                       Dart_CObject* message,
-                       void* peer) {
+void IOServiceCallback(Dart_Port dest_port_id, Dart_CObject* message) {
   Dart_Port reply_port_id = ILLEGAL_PORT;
   CObject* response = CObject::IllegalArgumentError();
   CObjectArray request(message);
@@ -57,7 +55,7 @@ void IOServiceCallback(Dart_Port dest_port_id,
 
 
 Dart_Port IOService::GetServicePort() {
-  return Dart_NewNativePort("IOService", IOServiceCallback, true, NULL);
+  return Dart_NewNativePort("IOService", IOServiceCallback, true);
 }