Revert of Replacing DtlsIdentityStoreInterface with RTCCertificateGeneratorInterface.

webrtc/examples/peerconnection/client/conductor.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 111 matching lines @@
   webrtc::FakeConstraints constraints;
   if (dtls) {
     constraints.AddOptional(webrtc::MediaConstraintsInterface::kEnableDtlsSrtp,
                             "true");
   } else {
     constraints.AddOptional(webrtc::MediaConstraintsInterface::kEnableDtlsSrtp,
                             "false");
   }
 
   peer_connection_ = peer_connection_factory_->CreatePeerConnection(
-      config,
-      &constraints,
-      nullptr,
-      std::unique_ptr<rtc::RTCCertificateGeneratorInterface>(),
-      this);
+      config, &constraints, NULL, NULL, this);
   return peer_connection_.get() != NULL;
 }
 
 void Conductor::DeletePeerConnection() {
   peer_connection_ = NULL;
   active_streams_.clear();
   main_wnd_->StopLocalRenderer();
   main_wnd_->StopRemoteRenderer();
   peer_connection_factory_ = NULL;
   peer_id_ = -1;
@@ skipping 397 matching lines @@
 }
 
 void Conductor::OnFailure(const std::string& error) {
     LOG(LERROR) << error;
 }
 
 void Conductor::SendMessage(const std::string& json_object) {
   std::string* msg = new std::string(json_object);
   main_wnd_->QueueUIThreadCallback(SEND_MESSAGE_TO_PEER, msg);
 }