Remove QpackEncoder::DecodeDecoderStreamData() and QpackDecoder::DecodeEncoderStreamData().

gfe-relnote: n/a, change to QUIC v99-only code.  Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 262563279
Change-Id: I19edc5790e4f5ecf98536433bd297e05d86dd71e
diff --git a/quic/core/qpack/qpack_encoder_test.cc b/quic/core/qpack/qpack_encoder_test.cc
index 90caf44..8de95e4 100644
--- a/quic/core/qpack/qpack_encoder_test.cc
+++ b/quic/core/qpack/qpack_encoder_test.cc
@@ -131,7 +131,7 @@
 
   QpackEncoder encoder(&decoder_stream_error_delegate_);
   encoder.set_qpack_stream_sender_delegate(&encoder_stream_sender_delegate_);
-  encoder.DecodeDecoderStreamData(
+  encoder.decoder_stream_receiver()->Decode(
       QuicTextUtils::HexDecode("ffffffffffffffffffffff"));
 }