[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/noise_suppression_impl.cc

Index: webrtc/modules/audio_processing/noise_suppression_impl.cc
diff --git a/webrtc/modules/audio_processing/noise_suppression_impl.cc b/webrtc/modules/audio_processing/noise_suppression_impl.cc
index 15019112647efa1b02a15d65401b5499f21e670d..6f9b4e3c9618640f7d072fef3bfe15d81f3f37d3 100644
--- a/webrtc/modules/audio_processing/noise_suppression_impl.cc
+++ b/webrtc/modules/audio_processing/noise_suppression_impl.cc
@@ -63,7 +63,7 @@ int NoiseSuppressionImpl::AnalyzeCaptureAudio(AudioBuffer* audio) {
   assert(audio->num_frames_per_band() <= 160);
   assert(audio->num_channels() == num_handles());
 
-  for (int i = 0; i < num_handles(); ++i) {
+  for (size_t i = 0; i < num_handles(); ++i) {
     Handle* my_handle = static_cast<Handle*>(handle(i));
 
     WebRtcNs_Analyze(my_handle, audio->split_bands_const_f(i)[kBand0To8kHz]);
@@ -79,7 +79,7 @@ int NoiseSuppressionImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   assert(audio->num_frames_per_band() <= 160);
   assert(audio->num_channels() == num_handles());
 
-  for (int i = 0; i < num_handles(); ++i) {
+  for (size_t i = 0; i < num_handles(); ++i) {
     Handle* my_handle = static_cast<Handle*>(handle(i));
 #if defined(WEBRTC_NS_FLOAT)
     WebRtcNs_Process(my_handle,
@@ -122,7 +122,7 @@ NoiseSuppression::Level NoiseSuppressionImpl::level() const {
 float NoiseSuppressionImpl::speech_probability() const {
 #if defined(WEBRTC_NS_FLOAT)
   float probability_average = 0.0f;
-  for (int i = 0; i < num_handles(); i++) {
+  for (size_t i = 0; i < num_handles(); i++) {
     Handle* my_handle = static_cast<Handle*>(handle(i));
     probability_average += WebRtcNs_prior_speech_probability(my_handle);
   }
@@ -169,7 +169,7 @@ int NoiseSuppressionImpl::ConfigureHandle(void* handle) const {
 #endif
 }
 
-int NoiseSuppressionImpl::num_handles_required() const {
+size_t NoiseSuppressionImpl::num_handles_required() const {
   return apm_->num_output_channels();
 }