Fixing init time error in smoothing filter.

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.
  */
 
@@ skipping 41 matching lines @@
 
  private:
   void UpdateAlpha(int time_constant_ms);
   void ExtrapolateLastSample(int64_t time_ms);
 
   const int init_time_ms_;
   const float init_factor_;
   const float init_const_;
   const Clock* const clock_;
 
-  rtc::Optional<int64_t> first_sample_time_ms_;
+  rtc::Optional<int64_t> init_end_time_ms_;
   float last_sample_;
   float alpha_;
   float state_;
   int64_t last_state_time_ms_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SmoothingFilterImpl);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_SMOOTHING_FILTER_H_