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

webrtc/common_audio/vad/webrtc_vad.c

Index: webrtc/common_audio/vad/webrtc_vad.c
diff --git a/webrtc/common_audio/vad/webrtc_vad.c b/webrtc/common_audio/vad/webrtc_vad.c
index 5af1b5bb0bcf0c34ca964e3452e0ccb61ec7d968..80c8f3c88d8eadcc55aee275ea8f23ae24bd6594 100644
--- a/webrtc/common_audio/vad/webrtc_vad.c
+++ b/webrtc/common_audio/vad/webrtc_vad.c
@@ -56,7 +56,7 @@ int WebRtcVad_set_mode(VadInst* handle, int mode) {
 }
 
 int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
-                      int frame_length) {
+                      size_t frame_length) {
   int vad = -1;
   VadInstT* self = (VadInstT*) handle;
 
@@ -90,11 +90,11 @@ int WebRtcVad_Process(VadInst* handle, int fs, const int16_t* audio_frame,
   return vad;
 }
 
-int WebRtcVad_ValidRateAndFrameLength(int rate, int frame_length) {
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length) {
   int return_value = -1;
   size_t i;
   int valid_length_ms;
-  int valid_length;
+  size_t valid_length;
 
   // We only allow 10, 20 or 30 ms frames. Loop through valid frame rates and
   // see if we have a matching pair.
@@ -102,7 +102,7 @@ int WebRtcVad_ValidRateAndFrameLength(int rate, int frame_length) {
     if (kValidRates[i] == rate) {
       for (valid_length_ms = 10; valid_length_ms <= kMaxFrameLengthMs;
           valid_length_ms += 10) {
-        valid_length = (kValidRates[i] / 1000 * valid_length_ms);
+        valid_length = (size_t)(kValidRates[i] / 1000 * valid_length_ms);
         if (frame_length == valid_length) {
           return_value = 0;
           break;