Enable cert pinning for XMPP connection made by XmppClientSocketFactory.

jingle/glue/xmpp_client_socket_factory.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "jingle/glue/xmpp_client_socket_factory.h"
 
 #include "base/logging.h"
 #include "jingle/glue/fake_ssl_client_socket.h"
 #include "jingle/glue/proxy_resolving_client_socket.h"
 #include "net/socket/client_socket_factory.h"
@@ skipping 28 matching lines @@
   return (use_fake_ssl_client_socket_ ?
           new FakeSSLClientSocket(transport_socket) : transport_socket);
 }
 
 net::SSLClientSocket* XmppClientSocketFactory::CreateSSLClientSocket(
     net::ClientSocketHandle* transport_socket,
     const net::HostPortPair& host_and_port) {
   net::SSLClientSocketContext context;
   context.cert_verifier =
       request_context_getter_->GetURLRequestContext()->cert_verifier();
+  context.transport_security_state = request_context_getter_->
+      GetURLRequestContext()->transport_security_state();
+  DCHECK(context.transport_security_state);
   // TODO(rkn): context.server_bound_cert_service is NULL because the
   // ServerBoundCertService class is not thread safe.
   return client_socket_factory_->CreateSSLClientSocket(
       transport_socket, host_and_port, ssl_config_, context);
 }
 
 
 }  // namespace jingle_glue