Deactivated the intelligibility enhancement functionality by default

webrtc/modules/audio_processing/audio_processing.gypi

Index: webrtc/modules/audio_processing/audio_processing.gypi
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index 3cfc727020bbd4796135f13a5d15c204030f14bb..3b631661c29a3c5983e2521e62abbe0ab612575e 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -11,6 +11,9 @@
     'shared_generated_dir': '<(SHARED_INTERMEDIATE_DIR)/audio_processing/asm_offsets',
     # Outputs some low-level debug files.
     'aec_debug_dump%': 0,
+
+    # Chooses whether the intelligibility enhancer should be used.
+    'intelligibility_enhancer': 0,
   },
   'targets': [
     {
@@ -85,10 +88,6 @@
         '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_controller/biquad_filter.cc',
         'level_controller/biquad_filter.h',
         'level_controller/down_sampler.cc',
@@ -184,6 +183,17 @@
           'dependencies': ['audioproc_debug_proto'],
           'defines': ['WEBRTC_AUDIOPROC_DEBUG_DUMP'],
         }],
+        ['intelligibility_enhancer==1', {
+          'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=0',],
+          'sources': [
+            'intelligibility/intelligibility_enhancer.cc',
+            'intelligibility/intelligibility_enhancer.h',
+            'intelligibility/intelligibility_utils.cc',
+            'intelligibility/intelligibility_utils.h',
+          ],
+        }, {
+          'defines': ['WEBRTC_INTELLIGIBILITY_ENHANCER=0',],
+        }],
         ['prefer_fixed_point==1', {
           'defines': ['WEBRTC_NS_FIXED'],
           'sources': [