Convert channel counts to size_t.

webrtc/modules/audio_processing/noise_suppression_impl.h

 /*
  *  Copyright (c) 2012 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_PROCESSING_NOISE_SUPPRESSION_IMPL_H_
 #define WEBRTC_MODULES_AUDIO_PROCESSING_NOISE_SUPPRESSION_IMPL_H_
 
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/criticalsection.h"
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/modules/audio_processing/include/audio_processing.h"
 
 namespace webrtc {
 
 class AudioBuffer;
 
 class NoiseSuppressionImpl : public NoiseSuppression {
  public:
   explicit NoiseSuppressionImpl(rtc::CriticalSection* crit);
   ~NoiseSuppressionImpl() override;
 
   // TODO(peah): Fold into ctor, once public API is removed.
-  void Initialize(int channels, int sample_rate_hz);
+  void Initialize(size_t channels, int sample_rate_hz);
   void AnalyzeCaptureAudio(AudioBuffer* audio);
   void ProcessCaptureAudio(AudioBuffer* audio);
 
   // NoiseSuppression implementation.
   int Enable(bool enable) override;
   bool is_enabled() const override;
   int set_level(Level level) override;
   Level level() const override;
   float speech_probability() const override;
 
  private:
   class Suppressor;
   rtc::CriticalSection* const crit_;
   bool enabled_ GUARDED_BY(crit_) = false;
   Level level_ GUARDED_BY(crit_) = kModerate;
-  int channels_ GUARDED_BY(crit_) = 0;
+  size_t channels_ GUARDED_BY(crit_) = 0;
   int sample_rate_hz_ GUARDED_BY(crit_) = 0;
   std::vector<rtc::scoped_ptr<Suppressor>> suppressors_ GUARDED_BY(crit_);
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(NoiseSuppressionImpl);
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_NOISE_SUPPRESSION_IMPL_H_