Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/audio_encoder.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 72 matching lines @@
 
   // Returns the rate with which the RTP timestamps are updated. By default,
   // this is the same as sample_rate_hz().
   virtual int RtpTimestampRateHz() const;
 
   // Returns the number of 10 ms frames the encoder will put in the next
   // packet. This value may only change when Encode() outputs a packet; i.e.,
   // the encoder may vary the number of 10 ms frames from packet to packet, but
   // it must decide the length of the next packet no later than when outputting
   // the preceding packet.
-  virtual int Num10MsFramesInNextPacket() const = 0;
+  virtual size_t Num10MsFramesInNextPacket() const = 0;
 
   // Returns the maximum value that can be returned by
   // Num10MsFramesInNextPacket().
-  virtual int Max10MsFramesInAPacket() const = 0;
+  virtual size_t Max10MsFramesInAPacket() const = 0;
 
   // Returns the current target bitrate in bits/s. The value -1 means that the
   // codec adapts the target automatically, and a current target cannot be
   // provided.
   virtual int GetTargetBitrate() const = 0;
 
   // Changes the target bitrate. The implementation is free to alter this value,
   // e.g., if the desired value is outside the valid range.
   virtual void SetTargetBitrate(int bits_per_second) {}
 
@@ skipping 35 matching lines @@
   // Sets the maximum rate which the codec may not exceed for any packet.
   virtual void SetMaxRate(int max_rate_bps) = 0;
 
   // Informs the encoder about the maximum sample rate which the decoder will
   // use when decoding the bitstream. The implementation is free to disregard
   // this hint.
   virtual bool SetMaxPlaybackRate(int frequency_hz) = 0;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_AUDIO_ENCODER_H_