Fix strong mode errors in dart:io.

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 397 matching lines @@
   Completer _closeCompleter = new Completer();  // The network socket is gone.
   _FilterStatus _filterStatus = new _FilterStatus();
   bool _connectPending = true;
   bool _filterPending = false;
   bool _filterActive = false;
 
   _SecureFilter _secureFilter = new _SecureFilter();
   String _selectedProtocol;
 
   static Future<_RawSecureSocket> connect(
-      host,
+      dynamic/*String|InternetAddress*/ host,
       int requestedPort,
       {bool is_server,
        SecurityContext context,
        RawSocket socket,
        StreamSubscription subscription,
        List<int> bufferedData,
        bool requestClientCertificate: false,
        bool requireClientCertificate: false,
        bool onBadCertificate(X509Certificate certificate),
        List<String> supportedProtocols}) {
     _verifyFields(host, requestedPort, is_server,
                  requestClientCertificate, requireClientCertificate,
                  onBadCertificate);
     if (host is InternetAddress) host = host.host;
-    var address = socket.address;
-    if (host != null) address =  address._cloneWithNewHost(host);
+    InternetAddress address = socket.address;
+    if (host != null) {
+      address = InternetAddress._cloneWithNewHost(address, host);
+    }
     return new _RawSecureSocket(address,
                                 requestedPort,
                                 is_server,
                                 context,
                                 socket,
                                 subscription,
                                 bufferedData,
                                 requestClientCertificate,
                                 requireClientCertificate,
                                 onBadCertificate,
@@ skipping 65 matching lines @@
                             requestClientCertificate ||
                                 requireClientCertificate,
                             requireClientCertificate,
                             encodedProtocols);
       _secureHandshake();
     } catch (e, s) {
       _reportError(e, s);
     }
   }
 
-  StreamSubscription listen(void onData(RawSocketEvent data),
-                            {Function onError,
-                             void onDone(),
-                             bool cancelOnError}) {
+  StreamSubscription<RawSocketEvent> listen(void onData(RawSocketEvent data),
+                                            {Function onError,
+                                             void onDone(),
+                                             bool cancelOnError}) {
     _sendWriteEvent();
     return _stream.listen(onData,
                           onError: onError,
                           onDone: onDone,
                           cancelOnError: cancelOnError);
   }
 
   static void _verifyFields(host,
                             int requestedPort,
                             bool is_server,
@@ skipping 718 matching lines @@
 /**
  * An exception that happens in the handshake phase of establishing
  * a secure network connection, when looking up or verifying a
  * certificate.
  */
 class CertificateException extends TlsException {
   const CertificateException([String message = "",
                             OSError osError = null])
      : super._("CertificateException", message, osError);
 }