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 bfc00fd32dc79985df3c3fa41091e57989286458..bd8b5adabad0d968a8d90412fc01ab0c10ccea3e 100644
--- a/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
+++ b/webrtc/modules/audio_mixer/test/audio_mixer_unittest.cc
@@ -14,8 +14,8 @@
 #include <utility>
 
 #include "testing/gmock/include/gmock/gmock.h"
-#include "webrtc/modules/audio_mixer/audio_mixer_defines.h"
 #include "webrtc/modules/audio_mixer/audio_mixer.h"
+#include "webrtc/modules/audio_mixer/audio_mixer_defines.h"
 
 using testing::_;
 using testing::Exactly;
@@ -285,11 +285,12 @@ 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),
+              frame_for_mixing.num_channels_);
   }
 }