[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc

Index: webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc
diff --git a/webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc b/webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc
index 2f5e99433a38a830cf11cb4ef8af6bfda5b32245..5d6ec24f94e0f1dd33ab35885c5cd3043088b7c6 100644
--- a/webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc
+++ b/webrtc/modules/audio_processing/intelligibility/intelligibility_enhancer.cc
@@ -54,19 +54,19 @@ IntelligibilityEnhancer::TransformCallback::TransformCallback(
 
 void IntelligibilityEnhancer::TransformCallback::ProcessAudioBlock(
     const complex<float>* const* in_block,
-    int in_channels,
+    size_t in_channels,
     size_t frames,
-    int /* out_channels */,
+    size_t /* out_channels */,
     complex<float>* const* out_block) {
   DCHECK_EQ(parent_->freqs_, frames);
-  for (int i = 0; i < in_channels; ++i) {
+  for (size_t i = 0; i < in_channels; ++i) {
     parent_->DispatchAudio(source_, in_block[i], out_block[i]);
   }
 }
 
 IntelligibilityEnhancer::IntelligibilityEnhancer(size_t erb_resolution,
                                                  int sample_rate_hz,
-                                                 int channels,
+                                                 size_t channels,
                                                  int cv_type,
                                                  float cv_alpha,
                                                  size_t cv_win,
@@ -117,7 +117,7 @@ IntelligibilityEnhancer::IntelligibilityEnhancer(size_t erb_resolution,
   temp_out_buffer_ = static_cast<float**>(
       malloc(sizeof(*temp_out_buffer_) * channels_ +
              sizeof(**temp_out_buffer_) * chunk_length_ * channels_));
-  for (int i = 0; i < channels_; ++i) {
+  for (size_t i = 0; i < channels_; ++i) {
     temp_out_buffer_[i] =
         reinterpret_cast<float*>(temp_out_buffer_ + channels_) +
         chunk_length_ * i;
@@ -159,7 +159,7 @@ void IntelligibilityEnhancer::ProcessRenderAudio(float* const* audio) {
   // Process and enhance chunk of |audio|
   render_mangler_->ProcessChunk(audio, temp_out_buffer_);
 
-  for (int i = 0; i < channels_; ++i) {
+  for (size_t i = 0; i < channels_; ++i) {
     memcpy(audio[i], temp_out_buffer_[i],
            chunk_length_ * sizeof(**temp_out_buffer_));
   }