[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/gain_control_impl.cc

Index: webrtc/modules/audio_processing/gain_control_impl.cc
diff --git a/webrtc/modules/audio_processing/gain_control_impl.cc b/webrtc/modules/audio_processing/gain_control_impl.cc
index 8a3612dce5a7b7ea9c2b5a6c128329a3168b2da9..9a656c2c43f35026a95be3e024a454edbdc2f9c8 100644
--- a/webrtc/modules/audio_processing/gain_control_impl.cc
+++ b/webrtc/modules/audio_processing/gain_control_impl.cc
@@ -59,7 +59,7 @@ int GainControlImpl::ProcessRenderAudio(AudioBuffer* audio) {
 
   assert(audio->num_frames_per_band() <= 160);
 
-  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));
     int err = WebRtcAgc_AddFarend(
         my_handle,
@@ -86,7 +86,7 @@ int GainControlImpl::AnalyzeCaptureAudio(AudioBuffer* audio) {
 
   if (mode_ == kAdaptiveAnalog) {
     capture_levels_.assign(num_handles(), analog_capture_level_);
-    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));
       err = WebRtcAgc_AddMic(
           my_handle,
@@ -100,7 +100,7 @@ int GainControlImpl::AnalyzeCaptureAudio(AudioBuffer* audio) {
     }
   } else if (mode_ == kAdaptiveDigital) {
 
-    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));
       int32_t capture_level_out = 0;
 
@@ -137,7 +137,7 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   assert(audio->num_channels() == num_handles());
 
   stream_is_saturated_ = false;
-  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));
     int32_t capture_level_out = 0;
     uint8_t saturation_warning = 0;
@@ -166,7 +166,7 @@ int GainControlImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   if (mode_ == kAdaptiveAnalog) {
     // Take the analog level to be the average across the handles.
     analog_capture_level_ = 0;
-    for (int i = 0; i < num_handles(); i++) {
+    for (size_t i = 0; i < num_handles(); i++) {
       analog_capture_level_ += capture_levels_[i];
     }
 
@@ -330,7 +330,7 @@ int GainControlImpl::ConfigureHandle(void* handle) const {
   return WebRtcAgc_set_config(static_cast<Handle*>(handle), config);
 }
 
-int GainControlImpl::num_handles_required() const {
+size_t GainControlImpl::num_handles_required() const {
   return apm_->num_output_channels();
 }