Revert "Unify dart:isolate."

runtime/lib/isolate.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.
 
-patch class _ReceivePortFactory {
-  /* patch */ factory ReceivePort() {
+class _ReceivePortFactory {
+  factory ReceivePort() {
     return new _ReceivePortImpl();
   }
 }
 
+
 class _ReceivePortImpl implements ReceivePort {
+  /*--- public interface ---*/
   factory _ReceivePortImpl() native "ReceivePortImpl_factory";
 
   receive(void onMessage(var message, SendPort replyTo)) {
     _onMessage = onMessage;
   }
 
   close() {
     _portMap.remove(_id);
     _closeInternal(_id);
   }
@@ skipping 87 matching lines @@
   static _sendInternal(int sendId, int replyId, var message)
       native "SendPortImpl_sendInternal_";
 
   final int _id;
 }
 
 _getPortInternal() native "isolate_getPortInternal";
 
 ReceivePort _portInternal;
 
-patch ReceivePort get port() {
+ReceivePort get _port() {
   if (_portInternal === null) {
     _portInternal = _getPortInternal();
   }
   return _portInternal;
 }
 
-patch spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
+_spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
 
-patch spawnUri(String uri) native "isolate_spawnUri";
-
+_spawnUri(String uri) native "isolate_spawnUri";