Style changes in Audio Mixer

webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc

Index: webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
diff --git a/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc b/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
index 5258fdce9c8c1f5e2860616895cdf349194908cd..3c73f23e2fff1ef8b01393281e098fe6f6944ebc 100644
--- a/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
+++ b/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
@@ -287,11 +287,12 @@ TEST(AudioMixer, ParticipantNumberOfChannels) {
   ResetFrame(participant.fake_frame());
 
   EXPECT_EQ(0, mixer->SetMixabilityStatus(&participant, true));
-  for (size_t number_of_channels : {1, 2}) {
+  for (int number_of_channels : {1, 2}) {
     EXPECT_CALL(participant, GetAudioFrameWithMuted(_, kDefaultSampleRateHz))
         .Times(Exactly(1));
     mixer->Mix(kDefaultSampleRateHz, number_of_channels, &frame_for_mixing);
-    EXPECT_EQ(number_of_channels, frame_for_mixing.num_channels_);
+    EXPECT_EQ(static_cast<size_t>(number_of_channels),

[ossu, 2016/09/05 12:02:54]

I believe you should be able to use one of int or size_t throughout AudioMixer.
There should be no reason to cast between them unless you need to interface with
something external that is outside of your control (at least right now, in these
CLs). I believe I prefer size_t throughout for channel counts.

+              frame_for_mixing.num_channels_);
   }
 }