Get rid of a lot of () for getters.

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.
 
 patch class _ReceivePortFactory {
   /* patch */ factory ReceivePort() {
     return new _ReceivePortImpl();
   }
 }
 
@@ skipping 98 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() {
+patch ReceivePort get port {
   if (_portInternal === null) {
     _portInternal = _getPortInternal();
   }
   return _portInternal;
 }
 
 patch spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
 
 patch spawnUri(String uri) native "isolate_spawnUri";