Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/main/acm2/codec_manager.cc

 /*
  *  Copyright (c) 2015 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 308 matching lines @@
                        codec_owner_.SpeechEncoder()->SetFec(codec_fec_enabled_);
 
   return 0;
 }
 
 void CodecManager::RegisterEncoder(
     AudioEncoderMutable* external_speech_encoder) {
   // Make up a CodecInst.
   send_codec_inst_.channels = external_speech_encoder->NumChannels();
   send_codec_inst_.plfreq = external_speech_encoder->SampleRateHz();
-  send_codec_inst_.pacsize =
-      rtc::CheckedDivExact(external_speech_encoder->Max10MsFramesInAPacket() *
-                               send_codec_inst_.plfreq,
-                           100);
+  send_codec_inst_.pacsize = rtc::CheckedDivExact(
+      static_cast<int>(external_speech_encoder->Max10MsFramesInAPacket() *
+                       send_codec_inst_.plfreq),
+      100);
   send_codec_inst_.pltype = -1;  // Not valid.
   send_codec_inst_.rate = -1;    // Not valid.
   static const char kName[] = "external";
   memcpy(send_codec_inst_.plname, kName, sizeof(kName));
 
   if (stereo_send_)
     dtx_enabled_ = false;
   codec_fec_enabled_ = codec_fec_enabled_ &&
                        codec_owner_.SpeechEncoder()->SetFec(codec_fec_enabled_);
   int cng_pt = dtx_enabled_
@@ skipping 122 matching lines @@
     case 48000:
       return -1;
     default:
       FATAL() << sample_rate_hz << " Hz is not supported";
       return -1;
   }
 }
 
 }  // namespace acm2
 }  // namespace webrtc