Update dartc test expectations.

tests/standalone/io/http_server_socket_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.
 
 #import("dart:io");
 #import("dart:isolate");
 #import("dart:math");
 
 class ExpectedDataOutputStream implements OutputStream {
   ExpectedDataOutputStream(List<int> this._data,
@@ skipping 171 matching lines @@
           (HttpRequest request, HttpResponse response) {
             request.inputStream.onData = () {
             };
             request.inputStream.onClosed = () {
               response.outputStream.close();
             };
           };
 
       if (expectError) {
         ReceivePort port = new ReceivePort();
-        server.onError = (Exception error) {
+        server.onError = (var error) {
           port.close();
         };
       } else {
-        server.onError = (Exception error) {
+        server.onError = (var error) {
           Expect.fail("An error was not expected: $error");
         };
       }
 
       serverSocket.spawnSocket(requestString, responseString,
                                cutoff, closeAsError);
       // TODO(ajohnsen): Validate HttpServers number of connections.
     }
     for (int i = 1; i < responseString.length; i++) {
       bool _expectError = expectError && i < responseString.length - okayFrom;
       runSettings(i, false, _expectError);
       runSettings(i, true, _expectError);
     }
   }
   testContent(
       "GET / HTTP/1.1\r\nKeep-Alive: False\r\n\r\n",
       "HTTP/1.1 200 OK\r\ntransfer-encoding: chunked\r\nconnection: close"
       "\r\n\r\n0\r\n\r\n");
 
   server.close();
 }
 
 void main() {
   testSocketClose();
 }