Revert "Update includes for webrtc/{base => rtc_base} rename (1/3)"

webrtc/modules/audio_mixer/sine_wave_generator.h

 /*
  *  Copyright (c) 2017 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_MIXER_SINE_WAVE_GENERATOR_H_
 #define WEBRTC_MODULES_AUDIO_MIXER_SINE_WAVE_GENERATOR_H_
 
+#include "webrtc/base/checks.h"
 #include "webrtc/modules/include/module_common_types.h"
-#include "webrtc/rtc_base/checks.h"
 
 namespace webrtc {
 
 class SineWaveGenerator {
  public:
   SineWaveGenerator(float wave_frequency_hz, int16_t amplitude)
       : wave_frequency_hz_(wave_frequency_hz), amplitude_(amplitude) {
     RTC_DCHECK_GT(wave_frequency_hz, 0);
   }
 
   // Produces appropriate output based on frame->num_channels_,
   // frame->sample_rate_hz_.
   void GenerateNextFrame(AudioFrame* frame);
 
  private:
   float phase_ = 0.f;
   const float wave_frequency_hz_;
   const int16_t amplitude_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_MIXER_SINE_WAVE_GENERATOR_H_