Update audio code to use size_t more correctly,

webrtc/modules/audio_processing/vad/vad_audio_proc_internal.h

 /*
  *  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 56 matching lines @@
     0.64166810, 0.63153117, 0.62128512, 0.61093173, 0.60047278, 0.58991008,
     0.57924546, 0.56848075, 0.55761782, 0.54665854, 0.53560481, 0.52445853,
     0.51322164, 0.50189608, 0.49048379, 0.47898676, 0.46740697, 0.45574642,
     0.44400713, 0.43219112, 0.42030043, 0.40833713, 0.39630327, 0.38420093,
     0.37203222, 0.35979922, 0.34750406, 0.33514885, 0.32273574, 0.31026687,
     0.29774438, 0.28517045, 0.27254725, 0.25987696, 0.24716177, 0.23440387,
     0.22160547, 0.20876878, 0.19589602, 0.18298941, 0.17005118, 0.15708358,
     0.14408883, 0.13106918, 0.11802689, 0.10496421, 0.09188339, 0.07878670,
     0.06567639, 0.05255473, 0.03942400, 0.02628645, 0.01314436, 0.00000000};
 
-static const int kFilterOrder = 2;
+static const size_t kFilterOrder = 2;
 static const float kCoeffNumerator[kFilterOrder + 1] = {0.974827f,
                                                         -1.949650f,
                                                         0.974827f};
 static const float kCoeffDenominator[kFilterOrder + 1] = {1.0f,
                                                           -1.971999f,
                                                           0.972457f};
 
 static_assert(kFilterOrder + 1 ==
                   sizeof(kCoeffNumerator) / sizeof(kCoeffNumerator[0]),
               "numerator coefficients incorrect size");
 static_assert(kFilterOrder + 1 ==
                   sizeof(kCoeffDenominator) / sizeof(kCoeffDenominator[0]),
               "denominator coefficients incorrect size");
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_VAD_VAD_AUDIO_PROCESSING_H_