Don't call CreateDtlsTransport_n from non-network thread in WebRtcSession

webrtc/pc/webrtcsession.cc

 /*
  *  Copyright 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 1077 matching lines @@
                    << " on " << transport_name << ".";
       return true;
     }
 
     cricket::DtlsTransportInternal* rtp_dtls_transport =
         transport_controller_->CreateDtlsTransport(
             transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTP);
     bool need_rtcp = (ch->rtcp_dtls_transport() != nullptr);
     cricket::DtlsTransportInternal* rtcp_dtls_transport = nullptr;
     if (need_rtcp) {
-      rtcp_dtls_transport = transport_controller_->CreateDtlsTransport_n(
+      rtcp_dtls_transport = transport_controller_->CreateDtlsTransport(
           transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
     }
 
     ch->SetTransports(rtp_dtls_transport, rtcp_dtls_transport);
     LOG(LS_INFO) << "Enabled BUNDLE for " << ch->content_name() << " on "
                  << transport_name << ".";
     transport_controller_->DestroyDtlsTransport(
         old_transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTP);
     // If the channel needs rtcp, it means that the channel used to have a
     // rtcp transport which needs to be deleted now.
@@ skipping 1294 matching lines @@
       (rtp_data_channel_->rtcp_dtls_transport() != nullptr);
   channel_manager_->DestroyRtpDataChannel(rtp_data_channel_.release());
   transport_controller_->DestroyDtlsTransport(
       transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTP);
   if (need_to_delete_rtcp) {
     transport_controller_->DestroyDtlsTransport(
         transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
   }
 }
 }  // namespace webrtc