Removing QUIC_VERSION_18.

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index 96a4557f3277db6b0a7581103360ac768816c1d4..d0401671a842647572264edf6371b4a07ab5fed5 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -158,8 +158,6 @@ QuicVersionVector QuicSupportedVersions() {
 
 QuicTag QuicVersionToQuicTag(const QuicVersion version) {
   switch (version) {
-    case QUIC_VERSION_18:
-      return MakeQuicTag('Q', '0', '1', '8');
     case QUIC_VERSION_19:
       return MakeQuicTag('Q', '0', '1', '9');
     case QUIC_VERSION_21:
@@ -194,7 +192,6 @@ return #x
 
 string QuicVersionToString(const QuicVersion version) {
   switch (version) {
-    RETURN_STRING_LITERAL(QUIC_VERSION_18);
     RETURN_STRING_LITERAL(QUIC_VERSION_19);
     RETURN_STRING_LITERAL(QUIC_VERSION_21);
     RETURN_STRING_LITERAL(QUIC_VERSION_22);
@@ -277,15 +274,6 @@ QuicCongestionFeedbackFrame::~QuicCongestionFeedbackFrame() {}
 QuicRstStreamErrorCode AdjustErrorForVersion(
     QuicRstStreamErrorCode error_code,
     QuicVersion version) {
-  switch (error_code) {
-    case QUIC_RST_FLOW_CONTROL_ACCOUNTING:
-      if (version < QUIC_VERSION_18) {
-        return QUIC_STREAM_NO_ERROR;
-      }
-      break;
-    default:
-      return error_code;
-  }
   return error_code;
 }