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

webrtc/modules/audio_conference_mixer/source/level_indicator.cc

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 10 matching lines @@
       _currentLevel(0)
 {
 }
 
 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])
         {
             _max = speech[i];
         }
         if(min > speech[i])
         {
             min = speech[i];
         }
     }
@@ skipping 22 matching lines @@
         _count++;
     }
 }
 
 int32_t LevelIndicator::GetLevel()
 {
     return _currentLevel;
 }
 
 }  // namespace webrtc