Convert channel counts to size_t.

talk/media/base/codec.h

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 110 matching lines @@
 
   bool operator==(const Codec& c) const;
 
   bool operator!=(const Codec& c) const {
     return !(*this == c);
   }
 };
 
 struct AudioCodec : public Codec {
   int bitrate;
-  int channels;
+  size_t channels;
 
   // Creates a codec with the given parameters.
   AudioCodec(int id,
              const std::string& name,
              int clockrate,
              int bitrate,
-             int channels,
+             size_t channels,
              int preference);
   // Creates an empty codec.
   AudioCodec();
   AudioCodec(const AudioCodec& c);
   ~AudioCodec() = default;
 
   // Indicates if this codec is compatible with the specified codec.
   bool Matches(const AudioCodec& codec) const;
 
   static bool Preferable(const AudioCodec& first, const AudioCodec& other) {
@@ skipping 86 matching lines @@
 }
 
 bool CodecNamesEq(const std::string& name1, const std::string& name2);
 bool HasNack(const VideoCodec& codec);
 bool HasRemb(const VideoCodec& codec);
 bool HasTransportCc(const VideoCodec& codec);
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_CODEC_H_