Delete iSAC-fb from AudioCodingModule

webrtc/modules/audio_coding/main/acm2/audio_coding_module_impl.cc

 /*
  *  Copyright (c) 2012 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 990 matching lines @@
       *sample_rate_hz = 16000;
       *channels = 1;
       break;
 #endif
 #ifdef WEBRTC_CODEC_ISAC
     case acm2::ACMCodecDB::kISACSWB:
       *codec_name = "ISAC";
       *sample_rate_hz = 32000;
       *channels = 1;
       break;
-    case acm2::ACMCodecDB::kISACFB:
-      *codec_name = "ISAC";
-      *sample_rate_hz = 48000;
-      *channels = 1;
-      break;
 #endif
 #ifdef WEBRTC_CODEC_ILBC
     case acm2::ACMCodecDB::kILBC:
       *codec_name = "ILBC";
       *sample_rate_hz = 8000;
       *channels = 1;
       break;
 #endif
     case acm2::ACMCodecDB::kPCMA:
       *codec_name = "PCMA";
@@ skipping 59 matching lines @@
       *sample_rate_hz = 8000;
       *channels = 1;
       break;
     default:
       FATAL() << "Codec type " << codec_type << " not supported.";
   }
   return true;
 }
 
 }  // namespace webrtc