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

tests/standalone/io/testing_server.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.
 
-class TestingServer extends Isolate {
+class TestingServer {
 
   static final HOST = "127.0.0.1";
   static final INIT = 0;
   static final SHUTDOWN = -1;
 
   abstract void onConnection(Socket connection);
 
-  void main() {
-    void errorHandlerServer(Exception e) {
-      Expect.fail("Server socket error $e");
+  void errorHandlerServer(Exception e) {
+    Expect.fail("Server socket error $e");
+  }
+
+  void dispatch(message, SendPort replyTo) {
+    if (message == INIT) {
+      _server = new ServerSocket(HOST, 0, 10);
+      Expect.equals(true, _server !== null);
+      _server.onConnection = onConnection;
+      _server.onError = errorHandlerServer;
+      replyTo.send(_server.port, null);
+    } else if (message == SHUTDOWN) {
+      _server.close();
+      port.close();
     }
-
-    this.port.receive((message, SendPort replyTo) {
-      if (message == INIT) {
-        _server = new ServerSocket(HOST, 0, 10);
-        Expect.equals(true, _server !== null);
-        _server.onConnection = onConnection;
-        _server.onError = errorHandlerServer;
-        replyTo.send(_server.port, null);
-      } else if (message == SHUTDOWN) {
-        _server.close();
-        this.port.close();
-      }
-    });
   }
 
   ServerSocket _server;
 }
 
 class TestingServerTest {
 
-  TestingServerTest.start(TestingServer server)
+  TestingServerTest.start(SendPort port)
       : _receivePort = new ReceivePort(),
-        _sendPort = null {
-    server.spawn().then((SendPort port) {
-      _sendPort = port;
-      start();
-    });
+        _sendPort = port {
+    start();
   }
 
   abstract void run();
 
   void start() {
     _receivePort.receive((var message, SendPort replyTo) {
       _port = message;
       run();
     });
     _sendPort.send(TestingServer.INIT, _receivePort.toSendPort());
   }
 
   void shutdown() {
     _sendPort.send(TestingServer.SHUTDOWN, _receivePort.toSendPort());
     _receivePort.close();
   }
 
   int _port;
   ReceivePort _receivePort;
   SendPort _sendPort;
 }