Revert of Allow intelligibility to compile in apm

webrtc/modules/audio_processing/BUILD.gn

 # 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.
 
 import("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 71 matching lines @@
     "common.h",
     "echo_cancellation_impl.cc",
     "echo_cancellation_impl.h",
     "echo_control_mobile_impl.cc",
     "echo_control_mobile_impl.h",
     "gain_control_impl.cc",
     "gain_control_impl.h",
     "high_pass_filter_impl.cc",
     "high_pass_filter_impl.h",
     "include/audio_processing.h",
-    "intelligibility/intelligibility_enhancer.cc",
-    "intelligibility/intelligibility_enhancer.h",
-    "intelligibility/intelligibility_utils.cc",
-    "intelligibility/intelligibility_utils.h",
     "level_estimator_impl.cc",
     "level_estimator_impl.h",
     "noise_suppression_impl.cc",
     "noise_suppression_impl.h",
     "processing_component.cc",
     "processing_component.h",
     "rms_level.cc",
     "rms_level.h",
     "splitting_filter.cc",
     "splitting_filter.h",
@@ skipping 167 matching lines @@
 
     # Disable LTO in audio_processing_neon target due to compiler bug.
     if (rtc_use_lto) {
       cflags -= [
         "-flto",
         "-ffat-lto-objects",
       ]
     }
   }
 }