Change new List(n) to return fixed length list.

tests/standalone/io/socket_many_connections_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.
 //
 // Test creating a large number of socket connections.
 library ServerTest;
 
 import "dart:io";
 import "dart:isolate";
 part "testing_server.dart";
 
 const CONNECTIONS = 200;
 
 class SocketManyConnectionsTest {
 
   SocketManyConnectionsTest.start()
       : _receivePort = new ReceivePort(),
         _sendPort = null,
         _connections = 0,
-        _sockets = new List<Socket>.fixedLength(CONNECTIONS) {
+        _sockets = new List<Socket>(CONNECTIONS) {
     _sendPort = spawnFunction(startTestServer);
     initialize();
   }
 
   void run() {
 
     void connectHandler() {
       _connections++;
       if (_connections == CONNECTIONS) {
         for (int i = 0; i < CONNECTIONS; i++) {
@@ skipping 58 matching lines @@
         onDone: closeHandler,
         onError: errorHandler);
   }
 
   int _connections = 0;
 }
 
 main() {
   SocketManyConnectionsTest test = new SocketManyConnectionsTest.start();
 }