Remove AsyncError with Expando.

tests/standalone/io/secure_server_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 "package:expect/expect.dart";
@@ skipping 24 matching lines @@
 }
 
 void testInvalidBind() {
   int count = 0;
   ReceivePort port = new ReceivePort();
   port.receive((_, __) { count++; if (count == 3) port.close(); });
 
   // Bind to a unknown DNS name.
   SecureServerSocket.bind("ko.faar.__hest__", 0, 5, CERTIFICATE).then((_) {
     Expect.fail("Failure expected");
-  }).catchError((e) {
-    Expect.isTrue(e.error is SocketIOException);
+  }).catchError((error) {
+    Expect.isTrue(error is SocketIOException);
     port.toSendPort().send(1);
   });
 
   // Bind to an unavaliable IP-address.
   SecureServerSocket.bind("8.8.8.8", 0, 5, CERTIFICATE).then((_) {
     Expect.fail("Failure expected");
-  }).catchError((e) {
-    Expect.isTrue(e.error is SocketIOException);
+  }).catchError((error) {
+    Expect.isTrue(error is SocketIOException);
     port.toSendPort().send(1);
   });
 
   // Bind to a port already in use.
   // Either an error or a successful bind is allowed.
   // Windows platforms allow multiple binding to the same socket, with
   // unpredictable results.
   SecureServerSocket.bind(SERVER_ADDRESS, 0, 5, CERTIFICATE).then((s) {
     SecureServerSocket.bind(SERVER_ADDRESS,
                             s.port,
                             5,
                             CERTIFICATE).then((t) {
       Expect.equals('windows', Platform.operatingSystem);
       Expect.equals(s.port, t.port);
       s.close();
       t.close();
       port.toSendPort().send(1);
-    }).catchError((e) {
+    }).catchError((error) {
       Expect.notEquals('windows', Platform.operatingSystem);
-      Expect.isTrue(e.error is SocketIOException);
+      Expect.isTrue(error is SocketIOException);
       s.close();
       port.toSendPort().send(1);
     });
   });
 }
 
 void testSimpleConnect(String certificate) {
   ReceivePort port = new ReceivePort();
   SecureServerSocket.bind(SERVER_ADDRESS, 0, 5, certificate).then((server) {
     var clientEndFuture = SecureSocket.connect(HOST_NAME, server.port);
     server.listen((serverEnd) {
       clientEndFuture.then((clientEnd) {
         clientEnd.close();
         serverEnd.close();
         server.close();
         port.close();
       });
     });
   });
 }
 
 void testSimpleConnectFail(String certificate) {
   ReceivePort port = new ReceivePort();
   SecureServerSocket.bind(SERVER_ADDRESS, 0, 5, certificate).then((server) {
     var clientEndFuture = SecureSocket.connect(HOST_NAME, server.port)
       .then((clientEnd) {
         Expect.fail("No client connection expected.");
       })
-      .catchError((e) {
-        Expect.isTrue(e is AsyncError);
-        Expect.isTrue(e.error is SocketIOException);
+      .catchError((error) {
+        Expect.isTrue(error is SocketIOException);
       });
     server.listen((serverEnd) {
       Expect.fail("No server connection expected.");
     },
-    onError: (e) {
-      Expect.isTrue(e is AsyncError);
-      Expect.isTrue(e.error is SocketIOException);
+    onError: (error) {
+      Expect.isTrue(error is SocketIOException);
       clientEndFuture.then((_) => port.close());
     });
   });
 }
 
 void testServerListenAfterConnect() {
   ReceivePort port = new ReceivePort();
   SecureServerSocket.bind(SERVER_ADDRESS, 0, 5, CERTIFICATE).then((server) {
     Expect.isTrue(server.port > 0);
     var clientEndFuture = SecureSocket.connect(HOST_NAME, server.port);
@@ skipping 87 matching lines @@
   testArguments();
   testSimpleBind();
   testInvalidBind();
   testSimpleConnect(CERTIFICATE);
   testSimpleConnect("CN=localhost");
   testSimpleConnectFail("not_a_nickname");
   testSimpleConnectFail("CN=notARealDistinguishedName");
   testServerListenAfterConnect();
   testSimpleReadWrite();
 }