Revert of Replacing DtlsIdentityStoreInterface with RTCCertificateGeneratorInterface.

webrtc/api/peerconnectioninterface_unittest.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 598 matching lines @@
     EXPECT_EQ(PeerConnectionInterface::kStable, observer_.state_);
   }
 
   void CreatePeerConnectionExpectFail(const std::string& uri) {
     PeerConnectionInterface::RTCConfiguration config;
     PeerConnectionInterface::IceServer server;
     server.uri = uri;
     config.servers.push_back(server);
 
     scoped_refptr<PeerConnectionInterface> pc;
-    pc = pc_factory_->CreatePeerConnection(
-        config,
-        nullptr,
-        nullptr,
-        std::unique_ptr<rtc::RTCCertificateGeneratorInterface>(),
-        &observer_);
+    pc = pc_factory_->CreatePeerConnection(config, nullptr, nullptr, nullptr,
+                                           &observer_);
     EXPECT_EQ(nullptr, pc);
   }
 
   void CreatePeerConnectionWithDifferentConfigurations() {
     CreatePeerConnectionWithIceServer(kStunAddressOnly, "");
     EXPECT_EQ(1u, port_allocator_->stun_servers().size());
     EXPECT_EQ(0u, port_allocator_->turn_servers().size());
     EXPECT_EQ("address", port_allocator_->stun_servers().begin()->hostname());
     EXPECT_EQ(kDefaultStunPort,
               port_allocator_->stun_servers().begin()->port());
@@ skipping 2173 matching lines @@
   FakeConstraints updated_answer_c;
   answer_c.SetMandatoryReceiveAudio(false);
   answer_c.SetMandatoryReceiveVideo(false);
 
   cricket::MediaSessionOptions updated_answer_options;
   EXPECT_TRUE(
       ParseConstraintsForAnswer(&updated_answer_c, &updated_answer_options));
   EXPECT_TRUE(updated_answer_options.has_audio());
   EXPECT_TRUE(updated_answer_options.has_video());
 }