Use base::STLSetDifference() in place of std::set_difference().

content/renderer/media/webrtc/media_stream_track_metrics.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/webrtc/media_stream_track_metrics.h"
 
 #include <inttypes.h>
-#include <algorithm>
 #include <set>
 #include <string>
 
 #include "base/md5.h"
 #include "content/common/media/media_stream_track_metrics_host_messages.h"
 #include "content/renderer/render_thread_impl.h"
 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
 
 using webrtc::AudioTrackVector;
 using webrtc::MediaStreamInterface;
@@ skipping 150 matching lines @@
   audio_track_ids_ = all_audio_track_ids;
   video_track_ids_ = all_video_track_ids;
 }
 
 void MediaStreamTrackMetricsObserver::ReportAddedAndRemovedTracks(
     const IdSet& new_ids,
     const IdSet& old_ids,
     MediaStreamTrackMetrics::TrackType track_type) {
   DCHECK(has_reported_start_ && !has_reported_end_);
 
-  IdSet added_tracks;
-  std::set_difference(new_ids.begin(),
-                      new_ids.end(),
-                      old_ids.begin(),
-                      old_ids.end(),
-                      std::inserter(added_tracks, added_tracks.end()));
-
-  IdSet removed_tracks;
-  std::set_difference(old_ids.begin(),
-                      old_ids.end(),
-                      new_ids.begin(),
-                      new_ids.end(),
-                      std::inserter(removed_tracks, removed_tracks.end()));
+  IdSet added_tracks = base::STLSetDifference<IdSet>(new_ids, old_ids);
+  IdSet removed_tracks = base::STLSetDifference<IdSet>(old_ids, new_ids);
 
   ReportTracks(added_tracks, track_type, MediaStreamTrackMetrics::CONNECTED);
   ReportTracks(
       removed_tracks, track_type, MediaStreamTrackMetrics::DISCONNECTED);
 }
 
 void MediaStreamTrackMetricsObserver::ReportTracks(
     const IdSet& ids,
     MediaStreamTrackMetrics::TrackType track_type,
     MediaStreamTrackMetrics::LifetimeEvent event) {
@@ skipping 133 matching lines @@
 
 uint64 MediaStreamTrackMetrics::MakeUniqueId(const std::string& track_id,
                                              StreamType stream_type) {
   return MakeUniqueIdImpl(
       reinterpret_cast<uint64>(reinterpret_cast<void*>(this)),
       track_id,
       stream_type);
 }
 
 }  // namespace content