Make SendPortImpl_internalSend not take a reply port as argument.

runtime/lib/isolate_patch.dart

 // 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.
 
 import "dart:collection" show HashMap;
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() = _ReceivePortImpl;
 
   /* patch */ factory ReceivePort.fromRawReceivePort(RawReceivePort rawPort) =
@@ skipping 95 matching lines @@
   Function _handler;
 
   // id to RawReceivePort mapping.
   static final Map _portMap = new HashMap();
 }
 
 
 class _SendPortImpl implements SendPort {
   /*--- public interface ---*/
   void send(var message) {
-    _sendInternal(_id, 0, message);
+    _sendInternal(_id, message);
   }
 
   bool operator==(var other) {
     return (other is _SendPortImpl) && _id == other._id;
   }
 
   int get hashCode {
     const int MASK = 0x3FFFFFFF;
     int hash = _id;
     hash = (hash + ((hash & (MASK >> 10)) << 10)) & MASK;
     hash ^= (hash >> 6);
     hash = (hash + ((hash & (MASK >> 3)) << 3)) & MASK;
     hash ^= (hash >> 11);
     hash = (hash + ((hash & (MASK >> 15)) << 15)) & MASK;
     return hash;
   }
 
   /*--- private implementation ---*/
   const _SendPortImpl(int id) : _id = id;
 
   // _SendPortImpl._create is called from the VM when a new SendPort instance is
   // needed by the VM code.
   static SendPort _create(int id) {
     return new _SendPortImpl(id);
   }
 
   // Forward the implementation of sending messages to the VM. Only port ids
   // are being handed to the VM.
-  // TODO(14731): Remove replyId argument.
-  static _sendInternal(int sendId, int replyId, var message)
+  static _sendInternal(int sendId, var message)
       native "SendPortImpl_sendInternal_";
 
   final int _id;
 }
 
 typedef _MainFunction();
 typedef _MainFunctionArgs(args);
 typedef _MainFunctionArgsMessage(args, message);
 
 /**
@@ skipping 86 matching lines @@
   }
 
   static final RawReceivePort _self = _mainPort;
   static RawReceivePort get _mainPort native "Isolate_mainPort";
 
   static SendPort _spawnFunction(Function topLevelFunction)
       native "Isolate_spawnFunction";
 
   static SendPort _spawnUri(String uri) native "Isolate_spawnUri";
 }