Fixed lint warnings in webrtc/modules/remote_bitrate_estimator

webrtc/modules/remote_bitrate_estimator/tools/bwe_rtp.cc

 /*
  *  Copyright (c) 2014 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/modules/remote_bitrate_estimator/tools/bwe_rtp.h"
 
+#include <stdio.h>
+
+#include <set>
 #include <sstream>
-#include <stdio.h>
 #include <string>
 
 #include "gflags/gflags.h"
 #include "webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_abs_send_time.h"
 #include "webrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_single_stream.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h"
 #include "webrtc/test/rtp_file_reader.h"
 
 namespace flags {
@@ skipping 99 matching lines @@
             new webrtc::RemoteBitrateEstimatorSingleStream(observer, clock);
           *estimator_used = "RemoteBitrateEstimator";
           break;
         }
       default:
         assert(false);
     }
   }
   return true;
 }