Update from https://crrev.com/311076

net/quic/quic_protocol.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_protocol.h"
 
 #include "base/stl_util.h"
 #include "net/quic/quic_utils.h"
 
 using base::StringPiece;
@@ skipping 140 matching lines @@
 QuicVersionVector QuicSupportedVersions() {
   QuicVersionVector supported_versions;
   for (size_t i = 0; i < arraysize(kSupportedQuicVersions); ++i) {
     supported_versions.push_back(kSupportedQuicVersions[i]);
   }
   return supported_versions;
 }
 
 QuicTag QuicVersionToQuicTag(const QuicVersion version) {
   switch (version) {
-    case QUIC_VERSION_19:
-      return MakeQuicTag('Q', '0', '1', '9');
     case QUIC_VERSION_21:
       return MakeQuicTag('Q', '0', '2', '1');
     case QUIC_VERSION_22:
       return MakeQuicTag('Q', '0', '2', '2');
     case QUIC_VERSION_23:
       return MakeQuicTag('Q', '0', '2', '3');
     default:
       // This shold be an ERROR because we should never attempt to convert an
       // invalid QuicVersion to be written to the wire.
       LOG(ERROR) << "Unsupported QuicVersion: " << version;
@@ skipping 12 matching lines @@
            << QuicUtils::TagToString(version_tag);
   return QUIC_VERSION_UNSUPPORTED;
 }
 
 #define RETURN_STRING_LITERAL(x) \
 case x: \
 return #x
 
 string QuicVersionToString(const QuicVersion version) {
   switch (version) {
-    RETURN_STRING_LITERAL(QUIC_VERSION_19);
     RETURN_STRING_LITERAL(QUIC_VERSION_21);
     RETURN_STRING_LITERAL(QUIC_VERSION_22);
     RETURN_STRING_LITERAL(QUIC_VERSION_23);
     default:
       return "QUIC_VERSION_UNSUPPORTED";
   }
 }
 
 string QuicVersionVectorToString(const QuicVersionVector& versions) {
   string result = "";
@@ skipping 511 matching lines @@
       sent_time(sent_time),
       bytes_sent(0),
       nack_count(0),
       transmission_type(transmission_type),
       all_transmissions(nullptr),
       in_flight(false),
       is_unackable(false),
       is_fec_packet(false) {}
 
 }  // namespace net