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

webrtc/modules/audio_coding/neteq/comfort_noise.cc

Index: webrtc/modules/audio_coding/neteq/comfort_noise.cc
diff --git a/webrtc/modules/audio_coding/neteq/comfort_noise.cc b/webrtc/modules/audio_coding/neteq/comfort_noise.cc
index da9683b3f806b602aaa1d7413c363bb1f2b46ac0..3fe66077784cab2e4bc3358a85f2f6a0cd0363f2 100644
--- a/webrtc/modules/audio_coding/neteq/comfort_noise.cc
+++ b/webrtc/modules/audio_coding/neteq/comfort_noise.cc
@@ -79,8 +79,7 @@ int ComfortNoise::Generate(size_t requested_length,
   CNG_dec_inst* cng_inst = cng_decoder->CngDecoderInstance();
   // The expression &(*output)[0][0] is a pointer to the first element in
   // the first channel.
-  if (WebRtcCng_Generate(cng_inst, &(*output)[0][0],
-                         static_cast<int16_t>(number_of_samples),
+  if (WebRtcCng_Generate(cng_inst, &(*output)[0][0], number_of_samples,
                          new_period) < 0) {
     // Error returned.
     output->Zeros(requested_length);