Remove RED support from WebRtcVoiceEngine/MediaChannel.

webrtc/media/engine/webrtcvoiceengine.h

 /*
  *  Copyright (c) 2004 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 270 matching lines @@
     SendCodecSpec() {
       webrtc::CodecInst empty_inst = {0};
       codec_inst = empty_inst;
       codec_inst.pltype = -1;
     }
     bool nack_enabled = false;
     bool transport_cc_enabled = false;
     bool enable_codec_fec = false;
     bool enable_opus_dtx = false;
     int opus_max_playback_rate = 0;
-    int red_payload_type = -1;
     int cng_payload_type = -1;
     int cng_plfreq = -1;
     webrtc::CodecInst codec_inst;
   } send_codec_spec_;
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(WebRtcVoiceMediaChannel);
 };
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVOICEENGINE_H_