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

webrtc/common_audio/smoothing_filter.h

 /*
  *  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.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_SMOOTHING_FILTER_H_
-#define WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_SMOOTHING_FILTER_H_
+#ifndef WEBRTC_COMMON_AUDIO_SMOOTHING_FILTER_H_
+#define WEBRTC_COMMON_AUDIO_SMOOTHING_FILTER_H_
 
+#include "webrtc/base/analytics/exp_filter.h"
 #include "webrtc/base/constructormagic.h"
-#include "webrtc/base/exp_filter.h"
 #include "webrtc/base/optional.h"
 #include "webrtc/system_wrappers/include/clock.h"
 
 namespace webrtc {
 
 class SmoothingFilter {
  public:
   virtual ~SmoothingFilter() = default;
   virtual void AddSample(float sample) = 0;
   virtual rtc::Optional<float> GetAverage() const = 0;
@@ skipping 13 matching lines @@
  private:
   const int time_constant_ms_;
   const Clock* const clock_;
 
   bool first_sample_received_;
   bool initialized_;
   int64_t first_sample_time_ms_;
   int64_t last_sample_time_ms_;
   rtc::ExpFilter filter_;
 
-  RTC_DISALLOW_COPY_AND_ASSIGN(SmoothingFilterImpl);
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SmoothingFilterImpl);
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_SMOOTHING_FILTER_H_
+#endif  // WEBRTC_COMMON_AUDIO_SMOOTHING_FILTER_H_