Address some violations of chromium-style.

webrtc/modules/congestion_controller/probe_bitrate_estimator.cc

 /*
  *  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.
  */
 
@@ skipping 25 matching lines @@
 // The maximum time interval between first and the last probe on a cluster
 // on the sender side as well as the receive side.
 constexpr int kMaxProbeIntervalMs = 1000;
 }  // namespace
 
 namespace webrtc {
 
 ProbeBitrateEstimator::ProbeBitrateEstimator(RtcEventLog* event_log)
     : event_log_(event_log) {}
 
+ProbeBitrateEstimator::~ProbeBitrateEstimator() = default;
+
 int ProbeBitrateEstimator::HandleProbeAndEstimateBitrate(
     const PacketFeedback& packet_feedback) {
   int cluster_id = packet_feedback.pacing_info.probe_cluster_id;
   RTC_DCHECK_NE(cluster_id, PacedPacketInfo::kNotAProbe);
 
   EraseOldClusters(packet_feedback.arrival_time_ms - kMaxClusterHistoryMs);
 
   int payload_size_bits = packet_feedback.payload_size * 8;
   AggregatedCluster* cluster = &clusters_[cluster_id];
 
@@ skipping 95 matching lines @@
 void ProbeBitrateEstimator::EraseOldClusters(int64_t timestamp_ms) {
   for (auto it = clusters_.begin(); it != clusters_.end();) {
     if (it->second.last_receive_ms < timestamp_ms) {
       it = clusters_.erase(it);
     } else {
       ++it;
     }
   }
 }
 }  // namespace webrtc