Removing unnecessary parameters from CreateXChannel methods.

webrtc/pc/rtpsenderreceiver_unittest.cc

Index: webrtc/pc/rtpsenderreceiver_unittest.cc
diff --git a/webrtc/pc/rtpsenderreceiver_unittest.cc b/webrtc/pc/rtpsenderreceiver_unittest.cc
index 4bcbb51884e1889ed3713c651a165eee2cc6c6c6..105d9d31d49b8a936782d73260b778ebe07b621d 100644
--- a/webrtc/pc/rtpsenderreceiver_unittest.cc
+++ b/webrtc/pc/rtpsenderreceiver_unittest.cc
@@ -70,19 +70,16 @@ class RtpSenderReceiverTest : public testing::Test,
         stream_(MediaStream::Create(kStreamLabel1)) {
     // Create channels to be used by the RtpSenders and RtpReceivers.
     channel_manager_.Init();
-    bool rtcp_mux_required = true;
     bool srtp_required = true;
     cricket::DtlsTransportInternal* rtp_transport =
         fake_transport_controller_.CreateDtlsTransport(
             cricket::CN_AUDIO, cricket::ICE_CANDIDATE_COMPONENT_RTP);
     voice_channel_ = channel_manager_.CreateVoiceChannel(
         &fake_media_controller_, rtp_transport, nullptr, rtc::Thread::Current(),
-        cricket::CN_AUDIO, nullptr, rtcp_mux_required, srtp_required,
-        cricket::AudioOptions());
+        cricket::CN_AUDIO, srtp_required, cricket::AudioOptions());
     video_channel_ = channel_manager_.CreateVideoChannel(
         &fake_media_controller_, rtp_transport, nullptr, rtc::Thread::Current(),
-        cricket::CN_VIDEO, nullptr, rtcp_mux_required, srtp_required,
-        cricket::VideoOptions());
+        cricket::CN_VIDEO, srtp_required, cricket::VideoOptions());
     voice_channel_->Enable(true);
     video_channel_->Enable(true);
     voice_media_channel_ = media_engine_->GetVoiceChannel(0);