[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_device/android/audio_record_jni.cc

Index: webrtc/modules/audio_device/android/audio_record_jni.cc
diff --git a/webrtc/modules/audio_device/android/audio_record_jni.cc b/webrtc/modules/audio_device/android/audio_record_jni.cc
index c9d0f990f2effb14b5e13a4e86ce1b17413b9481..0ac3bed199955e9b863da77322edfc56f49858bc 100644
--- a/webrtc/modules/audio_device/android/audio_record_jni.cc
+++ b/webrtc/modules/audio_device/android/audio_record_jni.cc
@@ -40,7 +40,7 @@ AudioRecordJni::JavaAudioRecord::JavaAudioRecord(
 AudioRecordJni::JavaAudioRecord::~JavaAudioRecord() {}
 
 int AudioRecordJni::JavaAudioRecord::InitRecording(
-    int sample_rate, int channels) {
+    int sample_rate, size_t channels) {
   return audio_record_->CallIntMethod(init_recording_,
                                       static_cast<jint>(sample_rate),
                                       static_cast<jint>(channels));
@@ -170,8 +170,8 @@ void AudioRecordJni::AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) {
   const int sample_rate_hz = audio_parameters_.sample_rate();
   ALOGD("SetRecordingSampleRate(%d)", sample_rate_hz);
   audio_device_buffer_->SetRecordingSampleRate(sample_rate_hz);
-  const int channels = audio_parameters_.channels();
-  ALOGD("SetRecordingChannels(%d)", channels);
+  const size_t channels = audio_parameters_.channels();
+  ALOGD("SetRecordingChannels(%" PRIuS ")", channels);
   audio_device_buffer_->SetRecordingChannels(channels);
   total_delay_in_milliseconds_ =
       audio_manager_->GetDelayEstimateInMilliseconds();