Make event-handlers edge-triggered and move socket-state to Dart.

tests/standalone/io/secure_builtin_roots_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.
 
 import "dart:io";
 import "dart:async";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 import "package:path/path.dart";
@@ skipping 23 matching lines @@
 }
 
 void testGoogleUrl(bool expectSuccess) {
   // We need to use an external server that is backed by a
   // built-in root certificate authority.
 
   // First, check if the lookup fails.  If not then run the test.
   InternetAddress.lookup('www.google.com').then((_) {
     HttpClient client = new HttpClient();
     client.getUrl(Uri.parse('https://www.google.com'))
-      .then((request) => request.close())
+      .then((request) {
+        request.followRedirects = false;
+        return request.close();
+      })
       .then((response) {
         Expect.isTrue(expectSuccess, "Unexpected successful connection");
         print('SUCCESS');
-        return response.last;
+        return response.drain().catchError((_) {});
       })
       .catchError((error) {
         // Allow SocketExceptions if www.google.com is unreachable or down.
         Expect.isTrue((!expectSuccess && error is HandshakeException) ||
                       error is SocketException);
         print('SUCCESS');
       })
       .whenComplete(client.close);
   },
   onError: (e) {
@@ skipping 21 matching lines @@
     });
   }
 
   asyncStart();
   Future.wait([runChild(['--child']),
                runChild(['--child', '--database']),
                runChild(['--child', '--builtin-roots']),
                runChild(['--child', '--builtin-roots', '--database'])])
       .then((_) => asyncEnd());
   }