Deactivated the intelligibility enhancement functionality by default

webrtc/media/BUILD.gn

 # 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.
 
 import("//build/config/linux/pkg_config.gni")
 import("../build/webrtc.gni")
@@ skipping 123 matching lines @@
   }
 
   if (is_win) {
     cflags = [
       "/wd4245",  # conversion from "int" to "size_t", signed/unsigned mismatch.
       "/wd4267",  # conversion from "size_t" to "int", possible loss of data.
       "/wd4389",  # signed/unsigned mismatch.
     ]
   }
 
+  if (rtc_enable_intelligibility_enhancer) {
+    defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=1" ]
+  } else {
+    defines += [ "WEBRTC_INTELLIGIBILITY_ENHANCER=0" ]
+  }
+
   include_dirs = []
   if (rtc_build_libyuv) {
     deps += [ "$rtc_libyuv_dir" ]
     public_deps = [
       "$rtc_libyuv_dir",
     ]
   } else {
     # Need to add a directory normally exported by libyuv.
     include_dirs += [ "$rtc_libyuv_dir/include" ]
   }
@@ skipping 207 matching lines @@
     deps += [
       # TODO(kjellander): Move as part of work in bugs.webrtc.org/4243.
       ":rtc_media",
       ":rtc_unittest_main",
       "../audio",
       "../base:rtc_base_tests_utils",
       "../system_wrappers:metrics_default",
     ]
   }
 }