Added implementation of four functions in the BBR congestion controller.

webrtc/modules/remote_bitrate_estimator/test/estimators/congestion_window.h

 /*
  *  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.
  *
  */
 
 #ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_CONGESTION_WINDOW_H_
 #define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_CONGESTION_WINDOW_H_
 
-#include <climits>
-#include <list>
-#include <map>
-#include <memory>
-#include <utility>
-#include <vector>
-
-#include "webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h"
-#include "webrtc/modules/remote_bitrate_estimator/include/send_time_history.h"
-#include "webrtc/modules/remote_bitrate_estimator/test/bwe.h"
-
 namespace webrtc {
 namespace testing {
 namespace bwe {
 class CongestionWindow {
  public:
   void set_gain(float gain);
   size_t data_inflight();
   int64_t GetCongestionWindow();
 
   // Packet sent from sender, meaning it is inflight
   // until we receive it and we should add packet's size to data_inflight.
   void PacketSent();
 
   // Ack was received by sender, meaning
   // packet is no longer inflight.
   void AckReceived();
-
-  // Returnes whether or not data inflight has been under
-  // fixed value for past x rounds and y ms.
-  bool DataInflightDecreased();
 };
 }  // namespace bwe
 }  // namespace testing
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_TEST_ESTIMATORS_CONGESTION_WINDOW_H_