Remove AsyncError with Expando.

pkg/http/test/safe_http_server.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.
 
 library safe_http_server;
 
 import 'dart:async';
 import 'dart:io';
 import 'dart:uri';
 
@@ skipping 24 matching lines @@
 
   int get port => _inner.port;
 
   set sessionTimeout(int timeout) {
     _inner.sessionTimeout = timeout;
   }
 
   HttpConnectionsInfo connectionsInfo() => _inner.connectionsInfo();
 
   StreamSubscription<HttpRequest> listen(void onData(HttpRequest value),
-      {void onError(AsyncError error), void onDone(),
+      {void onError(error), void onDone(),
       bool cancelOnError: false}) {
     var subscription;
     subscription = super.listen((request) {
       onData(new _HttpRequestWrapper(request));
-    }, onError: (e) {
-      var error = e.error;
+    }, onError: (error) {
       // Ignore socket error 104, which is caused by a request being cancelled
       // before it writes any headers. There's no reason to care about such
       // requests.
       if (error is SocketIOException && error.osError.errorCode == 104) return;
       // Ignore any parsing errors, which come from malformed requests.
       if (error is HttpParserException) return;
       // Manually handle cancelOnError so the above (ignored) errors don't
       // cause unsubscription.
       if (cancelOnError) subscription.cancel();
-      if (onError != null) onError(e);
+      if (onError != null) onError(error);
     }, onDone: onDone);
     return subscription;
   }
 }
 
 /// A wrapper around [HttpRequest] for the sole purpose of swallowing errors on
 /// [HttpResponse.done].
 class _HttpRequestWrapper extends StreamView<List<int>> implements HttpRequest {
   final HttpRequest _inner;
   final HttpResponse response;
@@ skipping 62 matching lines @@
   void add(List<int> data) => _inner.add(data);
   Future<HttpResponse> addStream(Stream<List<int>> stream) =>
     _inner.addStream(stream);
   Future close() => _inner.close();
   void write(Object obj) => _inner.write(obj);
   void writeAll(Iterable objects, [String separator = ""]) =>
       _inner.writeAll(objects, separator);
   void writeCharCode(int charCode) => _inner.writeCharCode(charCode);
   void writeln([Object obj = ""]) => _inner.writeln(obj);
 }