Update a ton of audio code to use size_t more correctly and in general reduce

webrtc/modules/audio_coding/main/test/SpatialAudio.cc

 /*
  *  Copyright (c) 2012 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 141 matching lines @@
                                 const double rightPanning) {
   AudioFrame audioFrame;
   int32_t outFileSampFreq = _outFile.SamplingFrequency();
 
   const double rightToLeftRatio = rightPanning / leftPanning;
 
   _channel->SetIsStereo(true);
 
   while (!_inFile.EndOfFile()) {
     _inFile.Read10MsData(audioFrame);
-    for (int n = 0; n < audioFrame.samples_per_channel_; n++) {
+    for (size_t n = 0; n < audioFrame.samples_per_channel_; n++) {
       audioFrame.data_[n] = (int16_t) floor(
           audioFrame.data_[n] * leftPanning + 0.5);
     }
     CHECK_ERROR(_acmLeft->Add10MsData(audioFrame));
 
-    for (int n = 0; n < audioFrame.samples_per_channel_; n++) {
+    for (size_t n = 0; n < audioFrame.samples_per_channel_; n++) {
       audioFrame.data_[n] = (int16_t) floor(
           audioFrame.data_[n] * rightToLeftRatio + 0.5);
     }
     CHECK_ERROR(_acmRight->Add10MsData(audioFrame));
 
     CHECK_ERROR(_acmReceiver->PlayoutData10Ms(outFileSampFreq, &audioFrame));
     _outFile.Write10MsData(audioFrame);
   }
   _inFile.Rewind();
 }
 
 void SpatialAudio::EncodeDecode() {
   AudioFrame audioFrame;
   int32_t outFileSampFreq = _outFile.SamplingFrequency();
 
   _channel->SetIsStereo(false);
 
   while (!_inFile.EndOfFile()) {
     _inFile.Read10MsData(audioFrame);
     CHECK_ERROR(_acmLeft->Add10MsData(audioFrame));
 
     CHECK_ERROR(_acmReceiver->PlayoutData10Ms(outFileSampFreq, &audioFrame));
     _outFile.Write10MsData(audioFrame);
   }
   _inFile.Rewind();
 }
 
 }  // namespace webrtc