Add the internals of RtcEvent's subclasses

webrtc/logging/rtc_event_log/events/rtc_event_audio_receive_stream_config.cc

 /*
  *  Copyright (c) 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.
  */
 
 #include "webrtc/logging/rtc_event_log/events/rtc_event_audio_receive_stream_config.h"
 
+#include <utility>
+
+#include "webrtc/logging/rtc_event_log/rtc_stream_config.h"
+
 namespace webrtc {
 
+RtcEventAudioReceiveStreamConfig::RtcEventAudioReceiveStreamConfig(
+    std::unique_ptr<rtclog::StreamConfig> config)
+    : config_(std::move(config)) {}
+
+RtcEventAudioReceiveStreamConfig::~RtcEventAudioReceiveStreamConfig() = default;
+
 RtcEvent::Type RtcEventAudioReceiveStreamConfig::GetType() const {
   return RtcEvent::Type::AudioReceiveStreamConfig;
 }
 
 bool RtcEventAudioReceiveStreamConfig::IsConfigEvent() const {
   return true;
 }
 
 }  // namespace webrtc