Clean away use of RtpAudioFeedback interface from RTP/RTCP receiver code.

webrtc/modules/rtp_rtcp/test/testAPI/test_api_rtcp.cc

 /*
  *  Copyright (c) 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 83 matching lines @@
     rtp_payload_registry1_.reset(new RTPPayloadRegistry(
             RTPPayloadStrategy::CreateStrategy(true)));
     rtp_payload_registry2_.reset(new RTPPayloadRegistry(
             RTPPayloadStrategy::CreateStrategy(true)));
 
     module1 = RtpRtcp::CreateRtpRtcp(configuration);
 
     rtp_feedback1_.reset(new TestRtpFeedback(module1));
 
     rtp_receiver1_.reset(RtpReceiver::CreateAudioReceiver(
-        &fake_clock, NULL, receiver, rtp_feedback1_.get(),
+        &fake_clock, receiver, rtp_feedback1_.get(),
         rtp_payload_registry1_.get()));
 
     configuration.receive_statistics = receive_statistics2_.get();
     configuration.outgoing_transport = transport2;
     configuration.intra_frame_callback = myRTCPFeedback2;
 
     module2 = RtpRtcp::CreateRtpRtcp(configuration);
 
     rtp_feedback2_.reset(new TestRtpFeedback(module2));
 
     rtp_receiver2_.reset(RtpReceiver::CreateAudioReceiver(
-        &fake_clock, NULL, receiver, rtp_feedback2_.get(),
+        &fake_clock, receiver, rtp_feedback2_.get(),
         rtp_payload_registry2_.get()));
 
     transport1->SetSendModule(module2, rtp_payload_registry2_.get(),
                               rtp_receiver2_.get(), receive_statistics2_.get());
     transport2->SetSendModule(module1, rtp_payload_registry1_.get(),
                               rtp_receiver1_.get(), receive_statistics1_.get());
     myRTCPFeedback1->SetModule(module1);
     myRTCPFeedback2->SetModule(module2);
 
     module1->SetRTCPStatus(RtcpMode::kCompound);
@@ skipping 135 matching lines @@
   EXPECT_EQ(test_ssrc, report_blocks[0].sourceSSRC);
 
   EXPECT_EQ(0u, report_blocks[0].cumulativeLost);
   EXPECT_LT(0u, report_blocks[0].delaySinceLastSR);
   EXPECT_EQ(test_sequence_number, report_blocks[0].extendedHighSeqNum);
   EXPECT_EQ(0u, report_blocks[0].fractionLost);
 }
 
 }  // namespace
 }  // namespace webrtc