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_decoder_test.cc b/quic/core/qpack/qpack_decoder_test.cc
index 9fe3d8c..5190975 100644
--- a/quic/core/qpack/qpack_decoder_test.cc
+++ b/quic/core/qpack/qpack_decoder_test.cc
@@ -44,7 +44,7 @@
   ~QpackDecoderTest() override = default;
 
   void DecodeEncoderStreamData(QuicStringPiece data) {
-    qpack_decoder_.DecodeEncoderStreamData(data);
+    qpack_decoder_.encoder_stream_receiver()->Decode(data);
   }
 
   // Set up |progressive_decoder_|.