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

tests/isolate/isolate_negative_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.
 
 // Dart test program for testing that isolates are spawned.
 
 #library('IsolateNegativeTest');
 #import('dart:isolate');
 #import('../../lib/unittest/unittest.dart');
 
-class IsolateNegativeTest extends Isolate {
-  IsolateNegativeTest() : super();
-
-  void main() {
-    this.port.receive((ignored, replyTo) {
-      replyTo.send("foo", null);
-    });
-  }
+void entry() {
+  port.receive((ignored, replyTo) {
+    replyTo.send("foo", null);
+  });
 }
 
 main() {
   test("ensure isolate code is executed", () {
-    new IsolateNegativeTest().spawn().then(expectAsync1((SendPort port) {
-      port.call("foo").then(expectAsync1((message) {
-        Expect.equals(true, "Expected fail");   // <=-------- Should fail here.
-      }));
+    SendPort port = spawnFunction(entry);
+    port.call("foo").then(expectAsync1((message) {
+      Expect.equals(true, "Expected fail");   // <=-------- Should fail here.
     }));
   });
 }