Update audio code to use size_t more correctly,

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 54b0a28e52f35d02545436d38935c7641db63319..5829185d02e2cf626d054504ae29d3fbcff644db 100644
--- a/webrtc/modules/audio_coding/neteq/comfort_noise.cc
+++ b/webrtc/modules/audio_coding/neteq/comfort_noise.cc
@@ -75,8 +75,7 @@ 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);