Revert of Move smoothing filter to common audio.

webrtc/modules/remote_bitrate_estimator/aimd_rate_control_unittest.cc

 /*
  *  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.
  */
 #include <memory>
 
+#include "webrtc/modules/audio_coding/audio_network_adaptor/smoothing_filter.h"
 #include "webrtc/modules/remote_bitrate_estimator/aimd_rate_control.h"
-#include "webrtc/system_wrappers/include/clock.h"
 #include "webrtc/test/gtest.h"
 
 namespace webrtc {
 namespace {
 
 constexpr int64_t kClockInitialTime = 123456;
 
 struct AimdRateControlStates {
   std::unique_ptr<AimdRateControl> aimd_rate_control;
   std::unique_ptr<SimulatedClock> simulated_clock;
@@ skipping 59 matching lines @@
   auto states = CreateAimdRateControlStates();
   constexpr int kBitrate = 300000;
   InitBitrate(states, kBitrate, states.simulated_clock->TimeInMilliseconds());
   UpdateRateControl(states, kBwOverusing, kBitrate - 2000,
                     states.simulated_clock->TimeInMilliseconds());
   EXPECT_EQ(rtc::Optional<int>(46700),
             states.aimd_rate_control->GetLastBitrateDecreaseBps());
 }
 
 }  // namespace webrtc