Remove old isolate API and update all code in the repository to use

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.
 
 #import("dart:io");
 #import("dart:isolate");
 #source("testing_server.dart");
 
 final CONNECTIONS = 200;
 
 class SocketManyConnectionsTest {
 
   SocketManyConnectionsTest.start()
       : _receivePort = new ReceivePort(),
         _sendPort = null,
         _connections = 0,
         _sockets = new List<Socket>(CONNECTIONS) {
-    new TestServer().spawn().then((SendPort port) {
-      _sendPort = port;
-      start();
-    });
+    _sendPort = spawnFunction(startTestServer);
+    start();
   }
 
   void run() {
 
     void connectHandler() {
       _connections++;
       if (_connections == CONNECTIONS) {
         for (int i = 0; i < CONNECTIONS; i++) {
           _sockets[i].close();
         }
@@ skipping 24 matching lines @@
     _receivePort.close();
   }
 
   int _port;
   ReceivePort _receivePort;
   SendPort _sendPort;
   List<Socket> _sockets;
   int _connections;
 }
 
+
+void startTestServer() {
+  var server = new TestServer();
+  port.receive(server.dispatch);
+}
+
 class TestServer extends TestingServer {
 
   void onConnection(Socket connection) {
     Socket _client;
 
     void closeHandler() {
       connection.close();
     }
 
     void errorHandler(Exception e) {
       print("Socket error $e");
       connection.close();
     }
 
     _connections++;
     connection.onClosed = closeHandler;
     connection.onError = errorHandler;
   }
 
   int _connections = 0;
 }
 
 main() {
   SocketManyConnectionsTest test = new SocketManyConnectionsTest.start();
 }