[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/codecs/cng/include/audio_encoder_cng.h

 /*
  *  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 10 matching lines @@
 namespace webrtc {
 
 class Vad;
 
 class AudioEncoderCng final : public AudioEncoder {
  public:
   struct Config {
     Config();
     bool IsOk() const;
 
-    int num_channels;
+    size_t num_channels;
     int payload_type;
     // Caller keeps ownership of the AudioEncoder object.
     AudioEncoder* speech_encoder;
     Vad::Aggressiveness vad_mode;
     int sid_frame_interval_ms;
     int num_cng_coefficients;
     // The Vad pointer is mainly for testing. If a NULL pointer is passed, the
     // AudioEncoderCng creates (and destroys) a Vad object internally. If an
     // object is passed, the AudioEncoderCng assumes ownership of the Vad
     // object.
     Vad* vad;
   };
 
   explicit AudioEncoderCng(const Config& config);
 
   ~AudioEncoderCng() override;
 
   int SampleRateHz() const override;
-  int NumChannels() const override;
+  size_t NumChannels() const override;
   size_t MaxEncodedBytes() const override;
   int RtpTimestampRateHz() const override;
   size_t Num10MsFramesInNextPacket() const override;
   size_t Max10MsFramesInAPacket() const override;
   int GetTargetBitrate() const override;
   void SetTargetBitrate(int bits_per_second) override;
   void SetProjectedPacketLossRate(double fraction) override;
   EncodedInfo EncodeInternal(uint32_t rtp_timestamp,
                              const int16_t* audio,
                              size_t max_encoded_bytes,
@@ skipping 19 matching lines @@
   const int num_cng_coefficients_;
   std::vector<int16_t> speech_buffer_;
   std::vector<uint32_t> rtp_timestamps_;
   bool last_frame_active_;
   rtc::scoped_ptr<Vad> vad_;
   rtc::scoped_ptr<CNG_enc_inst, CngInstDeleter> cng_inst_;
 };
 
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_CNG_INCLUDE_AUDIO_ENCODER_CNG_H_