[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_device/dummy/file_audio_device.cc

Index: webrtc/modules/audio_device/dummy/file_audio_device.cc
diff --git a/webrtc/modules/audio_device/dummy/file_audio_device.cc b/webrtc/modules/audio_device/dummy/file_audio_device.cc
index a2eac8767389fd702e576832cf0d99e598a27f1d..e32e2c6b77fd44dd62edc7277be5737fa0db39d4 100644
--- a/webrtc/modules/audio_device/dummy/file_audio_device.cc
+++ b/webrtc/modules/audio_device/dummy/file_audio_device.cc
@@ -15,13 +15,13 @@
 namespace webrtc {
 
 int kRecordingFixedSampleRate = 48000;
-int kRecordingNumChannels = 2;
+size_t kRecordingNumChannels = 2;
 int kPlayoutFixedSampleRate = 48000;
-int kPlayoutNumChannels = 2;
-int kPlayoutBufferSize = kPlayoutFixedSampleRate / 100
-                         * kPlayoutNumChannels * 2;
-int kRecordingBufferSize = kRecordingFixedSampleRate / 100
-                           * kRecordingNumChannels * 2;
+size_t kPlayoutNumChannels = 2;
+size_t kPlayoutBufferSize =
+    kPlayoutFixedSampleRate / 100 * kPlayoutNumChannels * 2;
+size_t kRecordingBufferSize =
+    kRecordingFixedSampleRate / 100 * kRecordingNumChannels * 2;
 
 FileAudioDevice::FileAudioDevice(const int32_t id,
                                  const char* inputFilename,
@@ -195,9 +195,7 @@ int32_t FileAudioDevice::StartPlayout() {
   _playoutFramesLeft = 0;
 
   if (!_playoutBuffer) {
-      _playoutBuffer = new int8_t[2 *
-                                  kPlayoutNumChannels *
-                                  kPlayoutFixedSampleRate/100];
+      _playoutBuffer = new int8_t[kPlayoutBufferSize];
   }
   if (!_playoutBuffer) {
     _playing = false;