Using AudioOption to enable audio network adaptor.

webrtc/modules/audio_coding/acm2/audio_coding_module.cc

Index: webrtc/modules/audio_coding/acm2/audio_coding_module.cc
diff --git a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
index 99b539ab6440745769efcd58606f9fc6823cf4ca..43216d2d43724d8d27dd19ffb454ade59c40e4d4 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -1268,7 +1268,10 @@ void AudioCodingModuleImpl::GetDecodingCallStatistics(
 }  // namespace
 
 AudioCodingModule::Config::Config()
-    : id(0), neteq_config(), clock(Clock::GetRealTimeClock()) {
+    : id(0),
+      neteq_config(),
+      audio_network_adaptor_enabled(false),
+      clock(Clock::GetRealTimeClock()) {
   // Post-decode VAD is disabled by default in NetEq, however, Audio
   // Conference Mixer relies on VAD decisions and fails without them.
   neteq_config.enable_post_decode_vad = true;