Make hashCode a getter and not a method.

runtime/bin/socket_impl.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.
 
 
 class _SocketBase extends NativeFieldWrapperClass1 {
   // Bit flags used when communicating between the eventhandler and
   // dart code. The EVENT flags are used to indicate events of
   // interest when sending a message from dart code to the
   // eventhandler. When receiving a message from the eventhandler the
@@ skipping 205 matching lines @@
           break;
         default:
           doReportError(new Exception("Unknown error"));
           break;
       }
     } else {
       doReportError(new SocketIOException(message));
     }
   }
 
-  int hashCode() => _hashCode;
+  int get hashCode => _hashCode;
 
   bool _propagateError(Exception e) => false;
 
   abstract bool _isListenSocket();
   abstract bool _isPipe();
 
   // Is this socket closed.
   bool _closed;
 
   // Dedicated ReceivePort for socket events.
@@ skipping 336 matching lines @@
   bool _seenFirstOutEvent = false;
   bool _pipe = false;
   Function _clientConnectHandler;
   Function _clientWriteHandler;
   SocketInputStream _inputStream;
   SocketOutputStream _outputStream;
   String _remoteHost;
   int _remotePort;
   static SendPort _socketService;
 }