[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/codecs/red/audio_encoder_copy_red.cc

 /*
  *  Copyright (c) 2014 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 15 matching lines @@
 }
 
 int AudioEncoderCopyRed::SampleRateHz() const {
   return speech_encoder_->SampleRateHz();
 }
 
 int AudioEncoderCopyRed::RtpTimestampRateHz() const {
   return speech_encoder_->RtpTimestampRateHz();
 }
 
-int AudioEncoderCopyRed::NumChannels() const {
+size_t AudioEncoderCopyRed::NumChannels() const {
   return speech_encoder_->NumChannels();
 }
 
 size_t AudioEncoderCopyRed::MaxEncodedBytes() const {
   return 2 * speech_encoder_->MaxEncodedBytes();
 }
 
 size_t AudioEncoderCopyRed::Num10MsFramesInNextPacket() const {
   return speech_encoder_->Num10MsFramesInNextPacket();
 }
@@ skipping 50 matching lines @@
   info.payload_type = red_payload_type_;
   info.encoded_bytes = 0;
   for (std::vector<EncodedInfoLeaf>::const_iterator it = info.redundant.begin();
        it != info.redundant.end(); ++it) {
     info.encoded_bytes += it->encoded_bytes;
   }
   return info;
 }
 
 }  // namespace webrtc