Enable the bayesian bitrate estimator by default.

webrtc/modules/congestion_controller/delay_based_bwe.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.
  */
 
@@ skipping 59 matching lines @@
     void Update(int64_t now_ms, int bytes);
     rtc::Optional<uint32_t> bitrate_bps() const;
 
    private:
     float UpdateWindow(int64_t now_ms, int bytes, int rate_window_ms);
     int sum_;
     int64_t current_win_ms_;
     int64_t prev_time_ms_;
     float bitrate_estimate_;
     float bitrate_estimate_var_;
-    RateStatistics old_estimator_;
-    const bool in_experiment_;
   };
 
   Result IncomingPacketFeedback(const PacketFeedback& packet_feedback);
   Result OnLongFeedbackDelay(int64_t arrival_time_ms);
   // Updates the current remote rate estimate and returns true if a valid
   // estimate exists.
   bool UpdateEstimate(int64_t packet_arrival_time_ms,
                       int64_t now_ms,
                       rtc::Optional<uint32_t> acked_bitrate_bps,
                       uint32_t* target_bitrate_bps);
@@ skipping 23 matching lines @@
   int consecutive_delayed_feedbacks_;
   uint32_t last_logged_bitrate_;
   BandwidthUsage last_logged_state_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(DelayBasedBwe);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_CONGESTION_CONTROLLER_DELAY_BASED_BWE_H_