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

webrtc/pc/rtptransport.h

 /*
  *  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 55 matching lines @@
                   const rtc::PacketOptions& options,
                   int flags);
 
   bool HandlesPayloadType(int payload_type) const;
 
   void AddHandledPayloadType(int payload_type);
 
   // TODO(zstein): Consider having two signals - RtcPacketReceived and
   // RtcpPacketReceived.
   // The first argument is true for RTCP packets and false for RTP packets.
-  sigslot::signal3<bool, rtc::CopyOnWriteBuffer&, const rtc::PacketTime&>
+  sigslot::signal3<bool, rtc::CopyOnWriteBuffer*, const rtc::PacketTime&>
       SignalPacketReceived;
 
  protected:
   // TODO(zstein): Remove this when we remove RtpTransportAdapter.
   RtpTransportAdapter* GetInternal() override;
 
  private:
   bool HandlesPacket(const uint8_t* data, size_t len);
 
   void OnReadyToSend(rtc::PacketTransportInternal* transport);
@@ skipping 22 matching lines @@
   bool rtcp_ready_to_send_ = false;
 
   RtcpParameters rtcp_parameters_;
 
   cricket::BundleFilter bundle_filter_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_PC_RTPTRANSPORT_H_