relnote: Deprecate flag quic_disable_pre_32

net/quic/core/quic_protocol.cc

Index: net/quic/core/quic_protocol.cc
diff --git a/net/quic/core/quic_protocol.cc b/net/quic/core/quic_protocol.cc
index 4053dc09926905c02577153280afefefdcba2f76..7c99b8e26f971f6a6fa0169f1075e8187ff50e5f 100644
--- a/net/quic/core/quic_protocol.cc
+++ b/net/quic/core/quic_protocol.cc
@@ -187,11 +187,7 @@ QuicVersionVector FilterSupportedVersions(QuicVersionVector versions) {
   QuicVersionVector filtered_versions(versions.size());
   filtered_versions.clear();  // Guaranteed by spec not to change capacity.
   for (QuicVersion version : versions) {
-    if (version < QUIC_VERSION_32) {
-      if (!FLAGS_quic_disable_pre_32 && !FLAGS_quic_disable_pre_34) {
-        filtered_versions.push_back(version);
-      }
-    } else if (version < QUIC_VERSION_34) {
+    if (version < QUIC_VERSION_34) {
       if (!FLAGS_quic_disable_pre_34) {
         filtered_versions.push_back(version);
       }
@@ -223,10 +219,6 @@ QuicVersionVector VersionOfIndex(const QuicVersionVector& versions, int index) {
 
 QuicTag QuicVersionToQuicTag(const QuicVersion version) {
   switch (version) {
-    case QUIC_VERSION_30:
-      return MakeQuicTag('Q', '0', '3', '0');
-    case QUIC_VERSION_31:
-      return MakeQuicTag('Q', '0', '3', '1');
     case QUIC_VERSION_32:
       return MakeQuicTag('Q', '0', '3', '2');
     case QUIC_VERSION_33:
@@ -263,8 +255,6 @@ QuicVersion QuicTagToQuicVersion(const QuicTag version_tag) {
 
 string QuicVersionToString(const QuicVersion version) {
   switch (version) {
-    RETURN_STRING_LITERAL(QUIC_VERSION_30);
-    RETURN_STRING_LITERAL(QUIC_VERSION_31);
     RETURN_STRING_LITERAL(QUIC_VERSION_32);
     RETURN_STRING_LITERAL(QUIC_VERSION_33);
     RETURN_STRING_LITERAL(QUIC_VERSION_34);
@@ -784,8 +774,7 @@ StringPiece QuicPacket::Plaintext(QuicVersion version) const {
 }
 
 QuicVersionManager::QuicVersionManager(QuicVersionVector supported_versions)
-    : disable_pre_32_(FLAGS_quic_disable_pre_32),
-      disable_pre_34_(FLAGS_quic_disable_pre_34),
+    : disable_pre_34_(FLAGS_quic_disable_pre_34),
       enable_version_35_(FLAGS_quic_enable_version_35),
       enable_version_36_(FLAGS_quic_enable_version_36_v2),
       allowed_supported_versions_(supported_versions),
@@ -795,11 +784,9 @@ QuicVersionManager::QuicVersionManager(QuicVersionVector supported_versions)
 QuicVersionManager::~QuicVersionManager() {}
 
 const QuicVersionVector& QuicVersionManager::GetSupportedVersions() {
-  if (disable_pre_32_ != FLAGS_quic_disable_pre_32 ||
-      disable_pre_34_ != FLAGS_quic_disable_pre_34 ||
+  if (disable_pre_34_ != FLAGS_quic_disable_pre_34 ||
       enable_version_35_ != FLAGS_quic_enable_version_35 ||
       enable_version_36_ != FLAGS_quic_enable_version_36_v2) {
-    disable_pre_32_ = FLAGS_quic_disable_pre_32;
     disable_pre_34_ = FLAGS_quic_disable_pre_34;
     enable_version_35_ = FLAGS_quic_enable_version_35;
     enable_version_36_ = FLAGS_quic_enable_version_36_v2;