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

webrtc/modules/audio_coding/codecs/pcm16b/pcm16b.c

 /*
  *  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.
  */
 
 #include "pcm16b.h"
 
 #include "webrtc/typedefs.h"
 
-int16_t WebRtcPcm16b_Encode(const int16_t* speech,
-                            int16_t len,
-                            uint8_t* encoded) {
-  int i;
+size_t WebRtcPcm16b_Encode(const int16_t* speech,
+                           size_t len,
+                           uint8_t* encoded) {
+  size_t i;
   for (i = 0; i < len; ++i) {
     uint16_t s = speech[i];
     encoded[2 * i] = s >> 8;
     encoded[2 * i + 1] = s;
   }
   return 2 * len;
 }
 
-int16_t WebRtcPcm16b_Decode(const uint8_t* encoded,
-                            int16_t len,
-                            int16_t* speech) {
-  int i;
+size_t WebRtcPcm16b_Decode(const uint8_t* encoded,
+                           size_t len,
+                           int16_t* speech) {
+  size_t i;
   for (i = 0; i < len / 2; ++i)
     speech[i] = encoded[2 * i] << 8 | encoded[2 * i + 1];
   return len / 2;
 }