convert isolates to use Future

tests/isolate/src/MintMakerTest.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.
 
 // Things that should be "auto-generated" are between AUTO START and
 // AUTO END (or just AUTO if it's a single line).
 
 
 class Mint {
   Mint() : registry_ = new Map<SendPort, Purse>() {
@@ skipping 165 matching lines @@
 
   void makeMint(handleMint(MintWrapper mint)) {
     port_.then((SendPort port) {
       port.call(null).receive((var message, SendPort replyTo) {
         SendPort mint = message[0];
         handleMint(new MintWrapper(mint));
       });
     });
   }
 
-  Promise<SendPort> port_;
+  Future<SendPort> port_;
 }
 
 
 class MintMakerTest {
   static void testMain() {
     MintMakerWrapper mintMaker = new MintMakerWrapper();
     mintMaker.makeMint((MintWrapper mint) {
       mint.createPurse(100, (PurseWrapper purse) {
         purse.queryBalance((int balance) {
           Expect.equals(100, balance);
@@ skipping 66 matching lines @@
     Expect.equals(0 + 5 + 42, sprouted.queryBalance());
     Expect.equals(100 - 5 - 42, purse.queryBalance());
   }
   */
 
 }
 
 main() {
   MintMakerTest.testMain();
 }