Remove the audio codec factory methods that don't take AudioCodecPairId

Bug: webrtc:9062
Change-Id: I929097f45986335633ccf01462348c9d24202424
Reviewed-on: https://webrtc-review.googlesource.com/74441
Commit-Queue: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23487}
diff --git a/api/audio_codecs/audio_decoder_factory.h b/api/audio_codecs/audio_decoder_factory.h
index 9954f31..fb1c965 100644
--- a/api/audio_codecs/audio_decoder_factory.h
+++ b/api/audio_codecs/audio_decoder_factory.h
@@ -41,11 +41,7 @@
   // work.
   virtual std::unique_ptr<AudioDecoder> MakeAudioDecoder(
       const SdpAudioFormat& format,
-      rtc::Optional<AudioCodecPairId> codec_pair_id);
-
-  // Deprecated version of the above.
-  virtual std::unique_ptr<AudioDecoder> MakeAudioDecoder(
-      const SdpAudioFormat& format);
+      rtc::Optional<AudioCodecPairId> codec_pair_id) = 0;
 };
 
 }  // namespace webrtc