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

tests/standalone/io/stream_pipe_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
 
 #import("dart:io");
@@ skipping 51 matching lines @@
 //  4. Pipes the socket output stream to the temp file.
 //  5. Expects the original file and the temp file to be equal.
 class PipeServerGame {
   int count = 0;
 
   PipeServerGame.start()
       : _receivePort = new ReceivePort(),
         _sendPort = null,
         _messages = 0 {
     _sendPort = spawnFunction(startPipeServer);
-    start();
+    initialize();
   }
 
   void runTest() {
 
     void connectHandler() {
       String srcFileName =
           getDataFilename("tests/standalone/io/readline_test1.dat");
 
       SocketOutputStream socketOutput = _socket.outputStream;
       InputStream fileInput = new File(srcFileName).openInputStream();
@@ skipping 34 matching lines @@
 
     // Connect to the server.
     _socket = new Socket(TestingServer.HOST, _port);
     if (_socket !== null) {
       _socket.onConnect = connectHandler;
     } else {
       Expect.fail("socket creation failed");
     }
   }
 
-  void start() {
+  void initialize() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       runTest();
     });
     _sendPort.send(TestingServer.INIT, _receivePort.toSendPort());
   }
 
   void shutdown() {
     _sendPort.send(TestingServer.SHUTDOWN, _receivePort.toSendPort());
     _receivePort.close();
@@ skipping 147 matching lines @@
   srcStream.pipe(dstStream, close: false);
 }
 
 
 main() {
   testFileToFilePipe1();
   testFileToFilePipe2();
   testFileToFilePipe3();
   PipeServerGame echoServerGame = new PipeServerGame.start();
 }