Big merge from experimental to bleeding edge.

tests/standalone/io/http_advanced_test.dart

 // 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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
-import "dart:isolate";
-import "dart:io";
+import 'dart:async';
+import 'dart:io';
+import 'dart:isolate';
 
 class TestServerMain {
   TestServerMain()
       : _statusPort = new ReceivePort(),
         _serverPort = null {
     _serverPort = spawnFunction(startTestServer);
   }
 
   void setServerStartedHandler(void startedCallback(int port)) {
     _startedCallback = startedCallback;
@@ skipping 436 matching lines @@
         completer.complete(true);
       };
     };
   });
   testServerMain.start();
   return completer.future;
 }
 
 void main() {
   print('testHost()');
-  testHost().chain((_) {
+  testHost().then((_) {
   print('testExpires()');
-    return testExpires().chain((_) {
+    return testExpires().then((_) {
       print('testContentType()');
-      return testContentType().chain((_) {
+      return testContentType().then((_) {
         print('testCookies()');
-        return testCookies().chain((_) {
+        return testCookies().then((_) {
           print('testFlush()');
           return testFlush();
         });
       });
     });
   }).then((_) {
     print('done');
   });
 }