Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/neteq/comfort_noise.cc

 /*
  *  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.
  */
 
@@ skipping 61 matching lines @@
   output->AssertSize(number_of_samples);
   // Get the decoder from the database.
   AudioDecoder* cng_decoder = decoder_database_->GetActiveCngDecoder();
   if (!cng_decoder) {
     LOG(LS_ERROR) << "Unknwown payload type";
     return kUnknownPayloadType;
   }
   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);
     internal_error_code_ = WebRtcCng_GetErrorCodeDec(cng_inst);
     LOG(LS_ERROR) << "WebRtcCng_Generate produced " << internal_error_code_;
     return kInternalError;
   }
 
   if (first_call_) {
     // Set tapering window parameters. Values are in Q15.
@@ skipping 37 matching lines @@
     }
     // Remove |overlap_length_| samples from the front of |output| since they
     // were mixed into |sync_buffer_| above.
     output->PopFront(overlap_length_);
   }
   first_call_ = false;
   return kOK;
 }
 
 }  // namespace webrtc