Update audio code to use size_t more correctly, webrtc/modules/ portion.

webrtc/modules/audio_conference_mixer/source/level_indicator.cc

Index: webrtc/modules/audio_conference_mixer/source/level_indicator.cc
diff --git a/webrtc/modules/audio_conference_mixer/source/level_indicator.cc b/webrtc/modules/audio_conference_mixer/source/level_indicator.cc
index 3c573d41aeeb713461cb5be0a5ec9f6a42519404..67c5bce29b9bfc99bac55228d39cc029aaa6b11b 100644
--- a/webrtc/modules/audio_conference_mixer/source/level_indicator.cc
+++ b/webrtc/modules/audio_conference_mixer/source/level_indicator.cc
@@ -28,10 +28,10 @@ LevelIndicator::~LevelIndicator()
 
 // Level is based on the highest absolute value for all samples.
 void LevelIndicator::ComputeLevel(const int16_t* speech,
-                                  const uint16_t nrOfSamples)
+                                  const size_t nrOfSamples)
 {
     int32_t min = 0;
-    for(uint32_t i = 0; i < nrOfSamples; i++)
+    for(size_t i = 0; i < nrOfSamples; i++)
     {
         if(_max < speech[i])
         {