Revert of Refactored incoming bitrate estimator.

webrtc/modules/congestion_controller/BUILD.gn

 # 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.
 
 import("../../webrtc.gni")
 
 rtc_static_library("congestion_controller") {
   sources = [
-    "acknowledge_bitrate_estimator.cc",
-    "acknowledge_bitrate_estimator.h",
     "congestion_controller.cc",
     "delay_based_bwe.cc",
     "delay_based_bwe.h",
     "include/congestion_controller.h",
     "include/receive_side_congestion_controller.h",
     "include/send_side_congestion_controller.h",
     "median_slope_estimator.cc",
     "median_slope_estimator.h",
     "probe_bitrate_estimator.cc",
     "probe_bitrate_estimator.h",
@@ skipping 86 matching lines @@
     sources = [
       "include/mock/mock_congestion_observer.h",
       "include/mock/mock_send_side_congestion_controller.h",
     ]
     deps = [
       ":congestion_controller",
       "../../test:test_support",
     ]
   }
 }