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

webrtc/common_audio/vad/include/webrtc_vad.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.
  */
 
 
 /*
  * This header file includes the VAD API calls. Specific function calls are given below.
  */
 
 #ifndef WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT
 #define WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_
 
+#include <stddef.h>
+
 #include "webrtc/typedefs.h"
 
 typedef struct WebRtcVadInst VadInst;
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 // Creates an instance to the VAD structure.
 VadInst* WebRtcVad_Create();
@@ skipping 30 matching lines @@
 // - handle       [i/o] : VAD Instance. Needs to be initialized by
 //                        WebRtcVad_Init() before call.
 // - fs           [i]   : Sampling frequency (Hz): 8000, 16000, or 32000
 // - audio_frame  [i]   : Audio frame buffer.
 // - frame_length [i]   : Length of audio frame buffer in number of samples.
 //
 // returns              : 1 - (Active Voice),
 //                        0 - (Non-active Voice),
 //                       -1 - (Error)
 int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
-                      int frame_length);
+                      size_t frame_length);
 
 // Checks for valid combinations of |rate| and |frame_length|. We support 10,
 // 20 and 30 ms frames and the rates 8000, 16000 and 32000 Hz.
 //
 // - rate         [i] : Sampling frequency (Hz).
 // - frame_length [i] : Speech frame buffer length in number of samples.
 //
 // returns            : 0 - (valid combination), -1 - (invalid combination)
-int WebRtcVad_ValidRateAndFrameLength(int rate, int frame_length);
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // WEBRTC_COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT