Stop using old AudioCodingModule::RegisterReceiveCodec overloads

webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h

Index: webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h
diff --git a/webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h b/webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h
index aab68aef7f7dfa1aebd0d64588765a47cf904893..de238c5600ec7c57d79e234023edf6c49db047a1 100644
--- a/webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h
+++ b/webrtc/modules/audio_coding/acm2/acm_receive_test_oldapi.h
@@ -50,12 +50,6 @@ class AcmReceiveTestOldApi {
   // files.
   void RegisterNetEqTestCodecs();
 
-  int RegisterExternalReceiveCodec(int rtp_payload_type,
-                                   AudioDecoder* external_decoder,
-                                   int sample_rate_hz,
-                                   int num_channels,
-                                   const std::string& name);
-
   // Runs the test and returns true if successful.
   void Run();