Convert channel counts to size_t.

webrtc/modules/audio_device/android/opensles_player.cc

Index: webrtc/modules/audio_device/android/opensles_player.cc
diff --git a/webrtc/modules/audio_device/android/opensles_player.cc b/webrtc/modules/audio_device/android/opensles_player.cc
index 9dc001c44d2e1abaa0b3b903009072dffee0b3a0..d2bff4905eba90837ef1b70687a6e116a99430b0 100644
--- a/webrtc/modules/audio_device/android/opensles_player.cc
+++ b/webrtc/modules/audio_device/android/opensles_player.cc
@@ -179,15 +179,15 @@ void OpenSLESPlayer::AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) {
   const int sample_rate_hz = audio_parameters_.sample_rate();
   ALOGD("SetPlayoutSampleRate(%d)", sample_rate_hz);
   audio_device_buffer_->SetPlayoutSampleRate(sample_rate_hz);
-  const int channels = audio_parameters_.channels();
-  ALOGD("SetPlayoutChannels(%d)", channels);
+  const size_t channels = audio_parameters_.channels();
+  ALOGD("SetPlayoutChannels(%" PRIuS ")", channels);
   audio_device_buffer_->SetPlayoutChannels(channels);
   RTC_CHECK(audio_device_buffer_);
   AllocateDataBuffers();
 }
 
 SLDataFormat_PCM OpenSLESPlayer::CreatePCMConfiguration(
-    int channels,
+    size_t channels,
     int sample_rate,
     size_t bits_per_sample) {
   ALOGD("CreatePCMConfiguration");