[NOT FOR REVIEW] Convert channel counts to size_t.

talk/media/base/audiorenderer.h

 /*
  * libjingle
  * Copyright 2013 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 23 matching lines @@
 
 // Abstract interface for rendering the audio data.
 class AudioRenderer {
  public:
   class Sink {
    public:
     // Callback to receive data from the AudioRenderer.
     virtual void OnData(const void* audio_data,
                         int bits_per_sample,
                         int sample_rate,
-                        int number_of_channels,
+                        size_t number_of_channels,
                         size_t number_of_frames) = 0;
 
     // Called when the AudioRenderer is going away.
     virtual void OnClose() = 0;
 
    protected:
     virtual ~Sink() {}
   };
 
   // Sets a sink to the AudioRenderer. There can be only one sink connected
@@ skipping 14 matching lines @@
   // AudioRenderer::Sink interface.
   virtual void RemoveChannel(int channel_id) {}
 
  protected:
   virtual ~AudioRenderer() {}
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_AUDIORENDERER_H_