Change IETF Frame/QUIC_VERSION_99 tests to be symbolic.

This CL replaces checks for QUIC_VERSION_99 that are controlling the IETF frames and their associated functionality with a function call . The function has a name that is indicative of the features for which the version is being checked -- VersionHasIetfQuicFrames().

gfe-relnote: N/A just changes the text by which we test if IETF QUIC has been negotiated.
PiperOrigin-RevId: 253767805
Change-Id: I08ae6738411ac151f90d5d085ea69af90d79fb80
diff --git a/quic/core/quic_stream_id_manager.cc b/quic/core/quic_stream_id_manager.cc
index 7eaa91d..793ee6c 100644
--- a/quic/core/quic_stream_id_manager.cc
+++ b/quic/core/quic_stream_id_manager.cc
@@ -229,7 +229,7 @@
 }
 
 bool QuicStreamIdManager::CanOpenNextOutgoingStream() {
-  DCHECK_EQ(QUIC_VERSION_99, transport_version());
+  DCHECK(VersionHasIetfQuicFrames(transport_version()));
   if (outgoing_stream_count_ < outgoing_max_streams_) {
     return true;
   }