convert isolate TestFramework from Promise Future

tests/isolate/src/Mixed2Test.dart

 // Copyright (c) 2011, 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 heavy and light isolates can be mixed.
 
 #library('Mixed2Test');
 #import('TestFramework.dart');
 
 // We want to send a message from the main-isolate to a chain of different
@@ skipping 89 matching lines @@
     this.port.receive((msg, replyTo) {
       pong.then((SendPort pongPort) {
         pongPort.send(msg + 30, replyTo);
         this.port.close();
       });
     });
   }
 }
 
 void test(TestExpectation expect) {
-  Promise<SendPort> heavy1 = expect.completes(new HeavyIsolate1().spawn());
-  Promise<SendPort> heavy2 = expect.completes(new HeavyIsolate2().spawn());
-  Promise<SendPort> heavy3 = expect.completes(new HeavyIsolate3().spawn());
+  Future<SendPort> heavy1 = expect.completes(new HeavyIsolate1().spawn());
+  Future<SendPort> heavy2 = expect.completes(new HeavyIsolate2().spawn());
+  Future<SendPort> heavy3 = expect.completes(new HeavyIsolate3().spawn());
 
   heavy2.then(expect.runs1((SendPort heavy2Port) {
     heavy3.then(expect.runs1((SendPort heavy3Port) {
       heavy2Port.call(heavy3Port).receive(expect.runs2((h2l1Port, ignored) {
         heavy1.then(expect.runs1((SendPort heavy1Port) {
           heavy1Port.send(h2l1Port, null);
           // ---------------
           // Setup complete.
           // Start the chain-message.
           heavy1Port.call(1).receive(expect.runs2((result, ignored) {
             Expect.equals(6531, result);
             expect.succeeded();
           }));
         }));
       }));
     }));
   }));
 }
 
 main() {
   runTests([test]);
 }