Remove the preprocessor symbol WEBRTC_CODEC_AVT (it was always defined)

webrtc/engine_configurations.h

 /*
  *  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 13 matching lines @@
 // iSAC and G722 are not included in the Mozilla build, but in all other builds.
 #ifndef WEBRTC_MOZILLA_BUILD
 #ifdef WEBRTC_ARCH_ARM
 #define WEBRTC_CODEC_ISACFX  // Fix-point iSAC implementation.
 #else
 #define WEBRTC_CODEC_ISAC  // Floating-point iSAC implementation (default).
 #endif  // WEBRTC_ARCH_ARM
 #define WEBRTC_CODEC_G722
 #endif  // !WEBRTC_MOZILLA_BUILD
 
-// AVT is included in all builds, along with G.711, NetEQ and CNG
-// (which are mandatory and don't have any defines).
-#define WEBRTC_CODEC_AVT
-
 // iLBC and Redundancy coding are excluded from Chromium and Mozilla
 // builds to reduce binary size.
 #if !defined(WEBRTC_CHROMIUM_BUILD) && !defined(WEBRTC_MOZILLA_BUILD)
 #define WEBRTC_CODEC_ILBC
 #define WEBRTC_CODEC_RED
 #endif  // !WEBRTC_CHROMIUM_BUILD && !WEBRTC_MOZILLA_BUILD
 
 // ----------------------------------------------------------------------------
 //  [Video] Codec settings
 // ----------------------------------------------------------------------------
@@ skipping 63 matching lines @@
 #define EAGL_RENDERING
 #endif
 
 // ----------------------------------------------------------------------------
 //  Deprecated
 // ----------------------------------------------------------------------------
 
 // #define WEBRTC_DTMF_DETECTION
 
 #endif  // WEBRTC_ENGINE_CONFIGURATIONS_H_