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

tests/isolate/request_reply_test.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 #library("RequestReplyTest");
 
 #import("dart:isolate");
 #import('../../lib/unittest/unittest.dart');
 
-class TestIsolate extends Isolate {
-
-  TestIsolate() : super();
-
-  void main() {
-    this.port.receive((message, SendPort replyTo) {
-      replyTo.send(message + 87);
-      this.port.close();
-    });
-  }
-
+void entry() {
+  port.receive((message, SendPort replyTo) {
+    replyTo.send(message + 87);
+    port.close();
+  });
 }
 
 void main() {
   test("call", () {
-    new TestIsolate().spawn().then(expectAsync1((SendPort port) {
-      port.call(42).then(expectAsync1((message) {
-        Expect.equals(42 + 87, message);
-      }));
+    SendPort port = spawnFunction(entry);
+    port.call(42).then(expectAsync1((message) {
+      Expect.equals(42 + 87, message);
     }));
   });
 
   test("send", () {
-    new TestIsolate().spawn().then(expectAsync1((SendPort port) {
-      ReceivePort reply = new ReceivePort();
-      port.send(99, reply.toSendPort());
-      reply.receive(expectAsync2((message, replyTo) {
-        Expect.equals(99 + 87, message);
-        reply.close();
-      }));
+    SendPort port = spawnFunction(entry);
+    ReceivePort reply = new ReceivePort();
+    port.send(99, reply.toSendPort());
+    reply.receive(expectAsync2((message, replyTo) {
+      Expect.equals(99 + 87, message);
+      reply.close();
     }));
   });
 }