Revert "Switch libraries to using new tags."

sdk/lib/io/secure_server_socket.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.
 
-part of dart_io;
 
 abstract class SecureServerSocket implements ServerSocket {
   /**
    * Constructs a new secure server socket, binds it to a given address
    * and port, and listens on it.  Incoming client connections are
    * promoted to secure connections, using the server certificate given by
    * certificate_name.  The bindAddress must be given as a numeric address,
    * not a host name.  The certificate name is the distinguished name (DN) of
    * the certificate, such as "CN=localhost" or "CN=myserver.mydomain.com".
    * The certificate is looked up in the NSS certificate database set by
@@ skipping 53 matching lines @@
                                                   connection.remotePort,
                                                   connection,
                                                   _certificate_name);
     _onConnectionCallback(secure_connection);
   }
 
   ServerSocket _socket;
   var _onConnectionCallback;
   String _certificate_name;
 }