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

webrtc/common_audio/vad/vad_filterbank.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 21 matching lines @@
 // WebRtcVad_GmmProbability() as a signal indicator, hence it is arbitrary above
 // the threshold |kMinEnergy|.
 //
 // - self         [i/o] : State information of the VAD.
 // - data_in      [i]   : Input audio data, for feature extraction.
 // - data_length  [i]   : Audio data size, in number of samples.
 // - features     [o]   : 10 * log10(energy in each frequency band), Q4.
 // - returns            : Total energy of the signal (NOTE! This value is not
 //                        exact. It is only used in a comparison.)
 int16_t WebRtcVad_CalculateFeatures(VadInstT* self, const int16_t* data_in,
-                                    int data_length, int16_t* features);
+                                    size_t data_length, int16_t* features);
 
 #endif  // WEBRTC_COMMON_AUDIO_VAD_VAD_FILTERBANK_H_