Move smoothing filter to common audio and exp_filter to base/analytics.

webrtc/common_audio/smoothing_filter.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 <cmath>
 
-#include "webrtc/modules/audio_coding/audio_network_adaptor/smoothing_filter.h"
+#include "webrtc/common_audio/smoothing_filter.h"
 
 namespace webrtc {
 
 SmoothingFilterImpl::SmoothingFilterImpl(int time_constant_ms,
                                          const Clock* clock)
     : time_constant_ms_(time_constant_ms),
       clock_(clock),
       first_sample_received_(false),
       initialized_(false),
       first_sample_time_ms_(0),
@@ skipping 29 matching lines @@
   last_sample_time_ms_ = now_ms;
 }
 
 rtc::Optional<float> SmoothingFilterImpl::GetAverage() const {
   float value = filter_.filtered();
   return value == rtc::ExpFilter::kValueUndefined ? rtc::Optional<float>()
                                                   : rtc::Optional<float>(value);
 }
 
 }  // namespace webrtc