Change the error handling in dart:io

tests/standalone/src/io/HttpServerSocketTest.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");
 
 class ExpectedDataOutputStream implements OutputStream {
   ExpectedDataOutputStream(List<int> this._data,
                            int this._cutoff,
                            bool this._closeAsError,
                            SocketMock this._socket);
 
   void set onNoPendingWrites(void callback()) {
     _onNoPendingWrites = callback;
   }
 
+  void set onError(void callback(e)) {
+    _onError = callback;
+  }
+
   bool write(List data, [bool copyBuffer = true]) {
     _onData(data);
     return true;
   }
 
   bool writeFrom(List data, [int offset = 0, int len]) {
     if (len === null) len = data.length - offset;
     _onData(data.getRange(offset, len));
     return true;
   }
@@ skipping 10 matching lines @@
     Expect.listEquals(data, _data.getRange(0, data.length));
     _data = _data.getRange(data.length, _data.length - data.length);
     _written += data.length;
     if (_written >= _cutoff) {
       // Tell HttpServer that the socket have closed.
       _socket._closeInternal(_closeAsError);
     }
   }
 
   Function _onNoPendingWrites;
+  Function _onError;
   List<int> _data;
   int _written = 0;
   int _cutoff;
   bool _closeAsError;
   SocketMock _socket;
 }
 
 class SocketMock implements Socket {
   SocketMock(List<int> this._data,
              List<int> expected,
@@ skipping 32 matching lines @@
   }
 
   void set onData(void callback()) {
     _onData = callback;
   }
 
   void set onClosed(void callback()) {
     _onClosed = callback;
   }
 
-  void set onError(void callback(Exception error)) {
+  void set onError(void callback(e)) {
     _onError = callback;
   }
 
   OutputStream get outputStream() => _outputStream;
 
   int hashCode() => _hashCode;
 
   List<int> _read;
   bool _closed = false;
   int _hashCode;
@@ skipping 29 matching lines @@
   }
 
   void close() {
     Expect.fail("Don't close the connection, we attach to this socket");
   }
 
   void set onConnection(void callback(Socket connection)) {
     _onConnection = callback;
   }
 
-  void set onError(void callback(Exception)) {
+  void set onError(void callback(e)) {
     _onError = callback;
   }
 
   int get port() => _port;
 
   int _port;
   Function _onConnection;
   Function _onError;
   Set<Socket> _sockets;
 }
@@ skipping 44 matching lines @@
       "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();
 }