deprecate FLAGS_quic_disable_pre_34

net/quic/core/quic_versions.cc

Index: net/quic/core/quic_versions.cc
diff --git a/net/quic/core/quic_versions.cc b/net/quic/core/quic_versions.cc
index d605eae6ed6c6cf0175b2c8a7b696cd07a843d6a..d6db947b3159c62bc0f94f6b6f352eaf3ebbba5a 100644
--- a/net/quic/core/quic_versions.cc
+++ b/net/quic/core/quic_versions.cc
@@ -34,11 +34,7 @@ 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_34) {
-      if (!FLAGS_quic_disable_pre_34) {
-        filtered_versions.push_back(version);
-      }
-    } else if (version == QUIC_VERSION_35) {
+    if (version == QUIC_VERSION_35) {
       if (FLAGS_quic_enable_version_35) {
         filtered_versions.push_back(version);
       }
@@ -66,10 +62,6 @@ QuicVersionVector VersionOfIndex(const QuicVersionVector& versions, int index) {
 
 QuicTag QuicVersionToQuicTag(const QuicVersion version) {
   switch (version) {
-    case QUIC_VERSION_32:
-      return MakeQuicTag('Q', '0', '3', '2');
-    case QUIC_VERSION_33:
-      return MakeQuicTag('Q', '0', '3', '3');
     case QUIC_VERSION_34:
       return MakeQuicTag('Q', '0', '3', '4');
     case QUIC_VERSION_35:
@@ -102,8 +94,6 @@ QuicVersion QuicTagToQuicVersion(const QuicTag version_tag) {
 
 string QuicVersionToString(const QuicVersion version) {
   switch (version) {
-    RETURN_STRING_LITERAL(QUIC_VERSION_32);
-    RETURN_STRING_LITERAL(QUIC_VERSION_33);
     RETURN_STRING_LITERAL(QUIC_VERSION_34);
     RETURN_STRING_LITERAL(QUIC_VERSION_35);
     RETURN_STRING_LITERAL(QUIC_VERSION_36);