Moved codec-specific audio packet splitting into decoders.

webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h

Index: webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h
diff --git a/webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h b/webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h
index 1083479ad864594ea88807f209aeec44fa3502c9..fdc856e985057e36f66e5759bc456bc98d867bc0 100644
--- a/webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h
+++ b/webrtc/modules/audio_coding/codecs/ilbc/audio_decoder_ilbc.h
@@ -25,6 +25,9 @@ class AudioDecoderIlbc final : public AudioDecoder {
   bool HasDecodePlc() const override;
   size_t DecodePlc(size_t num_frames, int16_t* decoded) override;
   void Reset() override;
+  std::vector<ParseResult> ParsePayload(rtc::Buffer&& payload,
+                                        uint32_t timestamp,
+                                        bool is_primary) override;
   int SampleRateHz() const override;
   size_t Channels() const override;