Re-enable function serialization test

tests/html/js_interop_func_passing_test_disabled.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('JsInteropFuncPassingTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
-#import('dart:html');
-#import('dart:isolate');
-
-injectSource(code) {
-  final script = new ScriptElement();
-  script.type = 'text/javascript';
-  script.innerHTML = code;
-  document.body.nodes.add(script);
-}
-
-var isolateTest = """
-  var port = new ReceivePortSync();
-  port.receive(function (f) {
-    return f('fromJS');
-  });
-  window.registerPort('test', port.toSendPort());
-""";
-
-main() {
-  useHtmlConfiguration();
-
-  test('dart-to-js-function', () {
-    injectSource(isolateTest);
-
-    SendPortSync port = window.lookupPort('test');
-    var result = port.callSync((msg) {
-      Expect.equals('fromJS', msg);
-      return 'received';
-    });
-    Expect.equals('received', result);
-  });
-}