Make Socket address and port getters available after the socket is closed

tests/standalone/io/raw_socket_test.dart

 // Copyright (c) 2013, 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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "dart:async";
@@ skipping 431 matching lines @@
   });
 }
 
 void testClosedError() {
   asyncStart();
   RawServerSocket.bind(InternetAddress.LOOPBACK_IP_V4, 0).then((server) {
     server.listen((socket) { socket.close(); });
     RawSocket.connect("127.0.0.1", server.port).then((socket) {
       server.close();
       socket.close();
-      Expect.throws(() => socket.port, (e) => e is SocketException);
       Expect.throws(() => socket.remotePort, (e) => e is SocketException);
-      Expect.throws(() => socket.address, (e) => e is SocketException);
       Expect.throws(() => socket.remoteAddress, (e) => e is SocketException);
       asyncEnd();
     });
   });
 }
 
 main() {
   asyncStart();
   testArguments();
   testSimpleBind();
   testCloseOneEnd("client");
   testCloseOneEnd("server");
   testInvalidBind();
   testSimpleConnect();
   testServerListenAfterConnect();
   testSimpleReadWrite(dropReads: false);
   testSimpleReadWrite(dropReads: true);
   testPauseServerSocket();
   testPauseSocket();
   testSocketZone();
   testSocketZoneError();
   testClosedError();
   asyncEnd();
 }