Deprecate quic_fix_handling_of_bad_prox_packet

gfe-relnote: deprecate gfe2_restart_flag_quic_fix_handling_of_bad_prox_packet
PiperOrigin-RevId: 295810991
Change-Id: Ie8e1bcbdeb6ae13702f263556c952dbb260f03af

quic/core/quic_framer.cc

diff --git a/quic/core/quic_framer.cc b/quic/core/quic_framer.cc
index 5d9acca..00bd6f4 100644
--- a/quic/core/quic_framer.cc
+++ b/quic/core/quic_framer.cc
@@ -423,8 +423,7 @@
       current_received_frame_type_(0) {
   DCHECK(!supported_versions.empty());
   version_ = supported_versions_[0];
-  DCHECK(version_.IsKnown() ||
-         !GetQuicRestartFlag(quic_fix_handling_of_bad_prox_packet))
+  DCHECK(version_.IsKnown())
       << ParsedQuicVersionVectorToString(supported_versions_);
 }
 

quic/core/quic_versions.cc

diff --git a/quic/core/quic_versions.cc b/quic/core/quic_versions.cc
index 33c5596..1599a31 100644
--- a/quic/core/quic_versions.cc
+++ b/quic/core/quic_versions.cc
@@ -92,14 +92,12 @@
 }
 
 bool ParsedQuicVersion::SupportsClientConnectionIds() const {
-  DCHECK(IsKnown() ||
-         !GetQuicRestartFlag(quic_fix_handling_of_bad_prox_packet));
+  DCHECK(IsKnown());
   return transport_version > QUIC_VERSION_48;
 }
 
 bool ParsedQuicVersion::HasLengthPrefixedConnectionIds() const {
-  DCHECK(IsKnown() ||
-         !GetQuicRestartFlag(quic_fix_handling_of_bad_prox_packet));
+  DCHECK(IsKnown());
   return VersionHasLengthPrefixedConnectionIds(transport_version);
 }
 
@@ -157,8 +155,7 @@
 
 bool VersionHasLengthPrefixedConnectionIds(
     QuicTransportVersion transport_version) {
-  DCHECK(transport_version != QUIC_VERSION_UNSUPPORTED ||
-         !GetQuicRestartFlag(quic_fix_handling_of_bad_prox_packet));
+  DCHECK(transport_version != QUIC_VERSION_UNSUPPORTED);
   return transport_version > QUIC_VERSION_48;
 }