Fix Chromium clang plugin warnings

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 2e7293c5a22181decf1a1d8d3817190b1792e880..4784a8721f8d049bd2628e0f151b0da0f3945b89 100644
--- a/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
+++ b/webrtc/modules/audio_coding/acm2/audio_coding_module.cc
@@ -1268,6 +1268,16 @@ void AudioCodingModuleImpl::GetDecodingCallStatistics(
 
 }  // namespace
 
+AudioCodingModule::Config::Config()
+    : id(0), neteq_config(), 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;
+}
+
+AudioCodingModule::Config::Config(const Config&) = default;
+AudioCodingModule::Config::~Config() = default;
+
 // Create module
 AudioCodingModule* AudioCodingModule::Create(int id) {
   Config config;