Remove unnecessary audio references in PeerConnectionFactory

pc/test/mock_peerconnection.h

 /*
  *  Copyright 2016 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 14 matching lines @@
 class FakePeerConnectionFactory
     : public rtc::RefCountedObject<webrtc::PeerConnectionFactory> {
  public:
   FakePeerConnectionFactory()
       : rtc::RefCountedObject<webrtc::PeerConnectionFactory>(
             rtc::Thread::Current(),
             rtc::Thread::Current(),
             rtc::Thread::Current(),
             nullptr,
             nullptr,
-            nullptr,
-            nullptr,
-            nullptr,
-            nullptr,
             std::unique_ptr<cricket::MediaEngineInterface>(),
             std::unique_ptr<webrtc::CallFactoryInterface>(),
             std::unique_ptr<RtcEventLogFactoryInterface>()) {}
 };
 
 class MockPeerConnection
     : public rtc::RefCountedObject<webrtc::PeerConnection> {
  public:
   MockPeerConnection()
       : rtc::RefCountedObject<webrtc::PeerConnection>(
             new FakePeerConnectionFactory(),
             std::unique_ptr<RtcEventLog>(),
             std::unique_ptr<Call>()) {}
   MOCK_METHOD0(local_streams,
                rtc::scoped_refptr<StreamCollectionInterface>());
   MOCK_METHOD0(remote_streams,
                rtc::scoped_refptr<StreamCollectionInterface>());
   MOCK_METHOD0(session, WebRtcSession*());
   MOCK_CONST_METHOD0(GetSenders,
                      std::vector<rtc::scoped_refptr<RtpSenderInterface>>());
   MOCK_CONST_METHOD0(GetReceivers,
                      std::vector<rtc::scoped_refptr<RtpReceiverInterface>>());
   MOCK_CONST_METHOD0(sctp_data_channels,
                      const std::vector<rtc::scoped_refptr<DataChannel>>&());
 };
 
 }  // namespace webrtc
 
 #endif  // PC_TEST_MOCK_PEERCONNECTION_H_