[Opus] Update to v1.2.1

third_party/opus/src/src/opus_private.h

Index: third_party/opus/src/src/opus_private.h
diff --git a/third_party/opus/src/src/opus_private.h b/third_party/opus/src/src/opus_private.h
index 3b62eed0964f0535ef12017c389abb627e3c4d0a..a731cc550ea43724d52beb650c4970da9adbda01 100644
--- a/third_party/opus/src/src/opus_private.h
+++ b/third_party/opus/src/src/opus_private.h
@@ -92,14 +92,6 @@ int encode_size(int size, unsigned char *data);
 
 opus_int32 frame_size_select(opus_int32 frame_size, int variable_duration, opus_int32 Fs);
 
-opus_int32 compute_frame_size(const void *analysis_pcm, int frame_size,
-      int variable_duration, int C, opus_int32 Fs, int bitrate_bps,
-      int delay_compensation, downmix_func downmix
-#ifndef DISABLE_FLOAT_API
-      , float *subframe_mem
-#endif
-      );
-
 opus_int32 opus_encode_native(OpusEncoder *st, const opus_val16 *pcm, int frame_size,
       unsigned char *data, opus_int32 out_data_bytes, int lsb_depth,
       const void *analysis_pcm, opus_int32 analysis_size, int c1, int c2,