In RtpPacket do not keep pointer to RtpHeaderExtensionMap

webrtc/modules/rtp_rtcp/source/rtp_packet_received.h

 /*
  *  Copyright (c) 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.
  */
 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_RECEIVED_H_
 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_RECEIVED_H_
 
 #include "webrtc/common_types.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_packet.h"
 #include "webrtc/system_wrappers/include/ntp_time.h"
 
 namespace webrtc {
 // Class to hold rtp packet with metadata for receiver side.
 class RtpPacketReceived : public rtp::Packet {
  public:
-  RtpPacketReceived() : Packet(nullptr) {}
+  RtpPacketReceived() = default;
   explicit RtpPacketReceived(const ExtensionManager* extensions)
       : Packet(extensions) {}
 
   void GetHeader(RTPHeader* header) const {
     Packet::GetHeader(header);
     header->payload_type_frequency = payload_type_frequency();
   }
 
   // Time in local time base as close as it can to packet arrived on the
   // network.
@@ skipping 15 matching lines @@
 
  private:
   NtpTime capture_time_;
   int64_t arrival_time_ms_ = 0;
   int payload_type_frequency_ = 0;
   bool retransmit_ = false;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_PACKET_RECEIVED_H_