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

tests/isolate/isolate2_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 exceptions in other isolates bring down
 // the program.
 
 #library('Isolate2NegativeTest');
 #import('dart:isolate');
 #import('../../lib/unittest/unittest.dart');
 
-class Isolate2NegativeTest extends Isolate {
-  Isolate2NegativeTest() : super();
-
-  void main() {
-    throw "foo";
-  }
+void entry() {
+  throw "foo";
 }
 
 main() {
   test("catch exception from other isolate", () {
-    // Calling 'then' ensures the test framework is aware that there is a
-    // pending callback, so it can fail quickly.
-    new Isolate2NegativeTest().spawn().then(expectAsync1((a) => null));
+    spawnFunction(entry);
   });
 }