Revert of Refactored incoming bitrate estimator.

webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc

Index: webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
diff --git a/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc b/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
index 62c9f881bc1ef1e92213efc871e6013bc2eddc6c..479ecb457b30b19f7cb4a02475ad19f1bcad6f17 100644
--- a/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
+++ b/webrtc/modules/congestion_controller/delay_based_bwe_unittest_helper.cc
@@ -14,7 +14,6 @@
 #include <utility>
 
 #include "webrtc/base/checks.h"
-#include "webrtc/base/ptr_util.h"
 #include "webrtc/modules/congestion_controller/delay_based_bwe.h"
 
 namespace webrtc {
@@ -150,8 +149,6 @@
 
 DelayBasedBweTest::DelayBasedBweTest()
     : clock_(100000000),
-      acknowledged_bitrate_estimator_(
-          rtc::MakeUnique<AcknowledgedBitrateEstimator>()),
       bitrate_estimator_(new DelayBasedBwe(nullptr, &clock_)),
       stream_generator_(new test::StreamGenerator(1e6,  // Capacity.
                                                   clock_.TimeInMicroseconds())),
@@ -184,10 +181,8 @@
                         sequence_number, payload_size, pacing_info);
   std::vector<PacketFeedback> packets;
   packets.push_back(packet);
-  acknowledged_bitrate_estimator_->IncomingPacketFeedbackVector(packets);
   DelayBasedBwe::Result result =
-      bitrate_estimator_->IncomingPacketFeedbackVector(
-          packets, acknowledged_bitrate_estimator_->bitrate_bps());
+      bitrate_estimator_->IncomingPacketFeedbackVector(packets);
   const uint32_t kDummySsrc = 0;
   if (result.updated) {
     bitrate_observer_.OnReceiveBitrateChanged({kDummySsrc},
@@ -218,11 +213,8 @@
     RTC_CHECK_GE(packet.arrival_time_ms + arrival_time_offset_ms_, 0);
     packet.arrival_time_ms += arrival_time_offset_ms_;
   }
-
-  acknowledged_bitrate_estimator_->IncomingPacketFeedbackVector(packets);
   DelayBasedBwe::Result result =
-      bitrate_estimator_->IncomingPacketFeedbackVector(
-          packets, acknowledged_bitrate_estimator_->bitrate_bps());
+      bitrate_estimator_->IncomingPacketFeedbackVector(packets);
   const uint32_t kDummySsrc = 0;
   if (result.updated) {
     bitrate_observer_.OnReceiveBitrateChanged({kDummySsrc},