Delete all use of tick_util.h.

webrtc/modules/audio_conference_mixer/source/time_scheduler.h

 /*
  *  Copyright (c) 2011 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.
  */
 
 // The TimeScheduler class keeps track of periodic events. It is non-drifting
 // and keeps track of any missed periods so that it is possible to catch up.
 // (compare to a metronome)
 
 #ifndef WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_TIME_SCHEDULER_H_
 #define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_TIME_SCHEDULER_H_
 
-#include "webrtc/system_wrappers/include/tick_util.h"
-
 namespace webrtc {
 class CriticalSectionWrapper;
 class TimeScheduler
 {
 public:
     TimeScheduler(const int64_t periodicityInMs);
     ~TimeScheduler();
 
     // Signal that a periodic event has been triggered.
     int32_t UpdateScheduler();
 
     // Set updateTimeInMs to the amount of time until UpdateScheduler() should
     // be called. This time will never be negative.
     int32_t TimeToNextUpdate(int64_t& updateTimeInMS) const;
 
 private:
     CriticalSectionWrapper* _crit;
 
     bool _isStarted;
-    TickTime _lastPeriodMark;
+    int64_t _lastPeriodMark; // In ns
 
     int64_t _periodicityInMs;
     int64_t _periodicityInTicks;
     uint32_t _missedPeriods;
 };
 }  // namespace webrtc
 
 #endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_TIME_SCHEDULER_H_