Make new StreamController be async by default.

sdk/lib/io/secure_socket.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 /**
  * A high-level class for communicating securely over a TCP socket, using
  * TLS and SSL. The [SecureSocket] exposes both a [Stream] and an
  * [IOSink] interface, making it ideal for using together with
@@ skipping 406 matching lines @@
       String this.certificateName,
       bool this.is_server,
       RawSocket socket,
       StreamSubscription this._socketSubscription,
       List<int> this._carryOverData,
       bool this.requestClientCertificate,
       bool this.requireClientCertificate,
       bool this.sendClientCertificate,
       bool this.onBadCertificate(X509Certificate certificate)) {
     _controller = new StreamController<RawSocketEvent>(
+        sync: true,
         onListen: _onSubscriptionStateChange,
         onPause: _onPauseStateChange,
         onResume: _onPauseStateChange,
         onCancel: _onSubscriptionStateChange);
     _stream = _controller.stream;
     // Throw an ArgumentError if any field is invalid.  After this, all
     // errors will be reported through the future or the stream.
     _verifyFields();
     _secureFilter.init();
     if (_carryOverData != null) _readFromCarryOver();
@@ skipping 528 matching lines @@
   void destroy();
   void handshake();
   void init();
   X509Certificate get peerCertificate;
   int processBuffer(int bufferIndex);
   void registerBadCertificateCallback(Function callback);
   void registerHandshakeCompleteCallback(Function handshakeCompleteHandler);
 
   List<_ExternalBuffer> get buffers;
 }