Revert of Remove various IDs

modules/audio_coding/acm2/acm_receive_test.cc

Index: modules/audio_coding/acm2/acm_receive_test.cc
diff --git a/modules/audio_coding/acm2/acm_receive_test.cc b/modules/audio_coding/acm2/acm_receive_test.cc
index 082506ab56b5ee5302bbf76e9c0dbdedd5ae6fbf..6cfe464a323f7724d70d4c2eae1fbad33139add5 100644
--- a/modules/audio_coding/acm2/acm_receive_test.cc
+++ b/modules/audio_coding/acm2/acm_receive_test.cc
@@ -110,6 +110,7 @@
     Clock* clock,
     rtc::scoped_refptr<AudioDecoderFactory> decoder_factory) {
   AudioCodingModule::Config config;
+  config.id = 0;
   config.clock = clock;
   config.decoder_factory = std::move(decoder_factory);
   return config;