[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_device/android/audio_manager.cc

Index: webrtc/modules/audio_device/android/audio_manager.cc
diff --git a/webrtc/modules/audio_device/android/audio_manager.cc b/webrtc/modules/audio_device/android/audio_manager.cc
index 81fabdf9fec08a996de2b057679dddbaf4f1276f..0999c56bf2087b5d0101e9f114cc4b3fec3002a4 100644
--- a/webrtc/modules/audio_device/android/audio_manager.cc
+++ b/webrtc/modules/audio_device/android/audio_manager.cc
@@ -191,8 +191,10 @@ void AudioManager::OnCacheAudioParameters(JNIEnv* env,
   hardware_aec_ = hardware_aec;
   low_latency_playout_ = low_latency_output;
   // TODO(henrika): add support for stereo output.
-  playout_parameters_.reset(sample_rate, channels, output_buffer_size);
-  record_parameters_.reset(sample_rate, channels, input_buffer_size);
+  playout_parameters_.reset(sample_rate, static_cast<size_t>(channels),
+                            output_buffer_size);
+  record_parameters_.reset(sample_rate, static_cast<size_t>(channels),
+                           input_buffer_size);
 }
 
 const AudioParameters& AudioManager::GetPlayoutAudioParameters() {