Fix shadowing in tests. Constructor and method are not allowed to have

tests/standalone/io/socket_close_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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 //
 // Test socket close events.
 
 #import("dart:io");
 #import("dart:isolate");
 
 const SERVERSHUTDOWN = -1;
 const ITERATIONS = 10;
 
 
 class SocketClose {
 
   SocketClose.start(this._mode, this._donePort)
       : _receivePort = new ReceivePort(),
         _sendPort = null,
         _readBytes = 0,
         _dataEvents = 0,
         _closeEvents = 0,
         _errorEvents = 0,
         _iterations = 0 {
     _sendPort = spawnFunction(startSocketCloseServer);
-    start();
+    initialize();
   }
 
   void proceed() {
     if (_iterations < ITERATIONS) {
       new Timer(0, sendData);
     } else {
       shutdown();
     }
   }
 
@@ skipping 96 matching lines @@
         default:
           Expect.fail("Unknown test mode");
       }
     }
 
     _socket = new Socket(SocketCloseServer.HOST, _port);
     Expect.equals(true, _socket !== null);
     _socket.onConnect = connectHandler;
   }
 
-  void start() {
+  void initialize() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       proceed();
     });
     _sendPort.send(_mode, _receivePort.toSendPort());
   }
 
   void shutdown() {
     _sendPort.send(SERVERSHUTDOWN, _receivePort.toSendPort());
     _receivePort.receive((message, ignore) {
@@ skipping 222 matching lines @@
   var tests = 7;
   var port = new ReceivePort();
   var completed = 0;
   port.receive((message, ignore) {
     if (++completed == tests) port.close();
   });
   for (var i = 0; i < tests; i++) {
     new SocketClose.start(i, port.toSendPort());
   }
 }