Adding packet overhead to audio network adaptor.

webrtc/modules/audio_coding/audio_network_adaptor/bitrate_controller.h

 /*
  *  Copyright (c) 2016 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 16 matching lines @@
   };
 
   explicit BitrateController(const Config& config);
 
   void MakeDecision(const NetworkMetrics& metrics,
                     AudioNetworkAdaptor::EncoderRuntimeConfig* config) override;
 
  private:
   const Config config_;
   int bitrate_bps_;
-  int overhead_rate_bps_;
+  int frame_length_ms_;
   RTC_DISALLOW_COPY_AND_ASSIGN(BitrateController);
 };
 
 }  // namespace audio_network_adaptor
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_CODING_AUDIO_NETWORK_ADAPTOR_BITRATE_CONTROLLER_H_