Remove SendPortSync and ReceivePortSync.

tests/html/js_interop_4_test.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
-
-library JsInterop4Test;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
-import 'dart:async';
-import 'dart:html';
-import 'dart:isolate';
-
-const testData = const [1, '2', 'true'];
-
-main() {
-  useHtmlConfiguration();
-
-  // Test that our interop scheme also works from Dart to Dart.
-  test('dart-to-dart-same-isolate', () {
-    var fun = expectAsync1((message) {
-      expect(message, orderedEquals(testData));
-      return message.length;
-    });
-
-    var port1 = new ReceivePortSync();
-    port1.receive(fun);
-    window.registerPort('fun', port1.toSendPort());
-
-    var port2 = window.lookupPort('fun');
-    var result = port2.callSync(testData);
-    expect(result, 3);
-  });
-}