Update includes for webrtc/{base => rtc_base} rename (2/3)

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 "webrtc/common_audio/smoothing_filter.h"
 
 #include <cmath>
 
-#include "webrtc/base/timeutils.h"
+#include "webrtc/rtc_base/timeutils.h"
 
 namespace webrtc {
 
 SmoothingFilterImpl::SmoothingFilterImpl(int init_time_ms)
     : init_time_ms_(init_time_ms),
       // Duing the initalization time, we use an increasing alpha. Specifically,
       //   alpha(n) = exp(-powf(init_factor_, n)),
       // where |init_factor_| is chosen such that
       //   alpha(init_time_ms_) = exp(-1.0f / init_time_ms_),
       init_factor_(init_time_ms_ == 0
@@ skipping 109 matching lines @@
 //        \end{cases}
 //   \end{align}
 // We know $\gamma = T^{-\frac{1}{T}}$, where $T$ denotes init\_time\_ms\_. Then
 // $1 - \gamma$ approaches zero when $T$ increases. This can cause numerical
 // difficulties. We multiply $T$ (if $T > 0$) to both numerator and denominator
 // in the fraction. See.
 //   \begin{align}
 //     \frac{\gamma^m - \gamma^n}{1 - \gamma}
 //     &= \frac{T^\frac{T-m}{T} - T^\frac{T-n}{T}}{T - T^{1-\frac{1}{T}}}
 //   \end{align}