SignalPacketReceived should pass packet as a pointer instead of a non-const reference.

webrtc/pc/rtptransport_unittest.cc

 /*
  *  Copyright 2017 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 144 matching lines @@
  public:
   explicit SignalPacketReceivedCounter(RtpTransport* transport) {
     transport->SignalPacketReceived.connect(
         this, &SignalPacketReceivedCounter::OnPacketReceived);
   }
   int rtcp_count() const { return rtcp_count_; }
   int rtp_count() const { return rtp_count_; }
 
  private:
   void OnPacketReceived(bool rtcp,
-                        rtc::CopyOnWriteBuffer&,
+                        rtc::CopyOnWriteBuffer*,
                         const rtc::PacketTime&) {
     if (rtcp) {
       ++rtcp_count_;
     } else {
       ++rtp_count_;
     }
   }
   int rtcp_count_ = 0;
   int rtp_count_ = 0;
 };
@@ skipping 51 matching lines @@
 
   const rtc::PacketOptions options;
   const int flags = 0;
   rtc::Buffer rtp_data(kRtpData, kRtpLen);
   fake_rtp.SendPacket(rtp_data.data<char>(), kRtpLen, options, flags);
   EXPECT_EQ(0, observer.rtp_count());
   EXPECT_EQ(0, observer.rtcp_count());
 }
 
 }  // namespace webrtc