deprecate -FLAGS_quic_reloadable_flag_quic_disable_version_34 and remove support for QUIC v34.

net/quic/core/quic_session.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/core/quic_session.h"
 
 #include <cstdint>
 #include <utility>
 
 #include "net/quic/core/quic_connection.h"
@@ skipping 418 matching lines @@
   return GetCryptoStream()->encryption_established();
 }
 
 bool QuicSession::IsCryptoHandshakeConfirmed() {
   return GetCryptoStream()->handshake_confirmed();
 }
 
 void QuicSession::OnConfigNegotiated() {
   connection_->SetFromConfig(config_);
 
-  const QuicVersion version = connection()->version();
   uint32_t max_streams = 0;
-  if (version > QUIC_VERSION_34 &&
-      config_.HasReceivedMaxIncomingDynamicStreams()) {
+  if (config_.HasReceivedMaxIncomingDynamicStreams()) {
     max_streams = config_.ReceivedMaxIncomingDynamicStreams();
   } else {
     max_streams = config_.MaxStreamsPerConnection();
   }
   set_max_open_outgoing_streams(max_streams);
   if (perspective() == Perspective::IS_SERVER) {
     if (config_.HasReceivedConnectionOptions()) {
       // The following variations change the initial receive flow control
       // window sizes.
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFW6)) {
         AdjustInitialFlowControlWindows(64 * 1024);
       }
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFW7)) {
         AdjustInitialFlowControlWindows(128 * 1024);
       }
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFW8)) {
         AdjustInitialFlowControlWindows(256 * 1024);
       }
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFW9)) {
         AdjustInitialFlowControlWindows(512 * 1024);
       }
       if (ContainsQuicTag(config_.ReceivedConnectionOptions(), kIFWA)) {
         AdjustInitialFlowControlWindows(1024 * 1024);
       }
     }
   }
 
-  if (version <= QUIC_VERSION_34) {
-    // A small number of additional incoming streams beyond the limit should be
-    // allowed. This helps avoid early connection termination when FIN/RSTs for
-    // old streams are lost or arrive out of order.
-    // Use a minimum number of additional streams, or a percentage increase,
-    // whichever is larger.
-    uint32_t max_incoming_streams =
-        std::max(max_streams + kMaxStreamsMinimumIncrement,
-                 static_cast<uint32_t>(max_streams * kMaxStreamsMultiplier));
-    set_max_open_incoming_streams(max_incoming_streams);
-  } else {
-    uint32_t max_incoming_streams_to_send =
-        config_.GetMaxIncomingDynamicStreamsToSend();
-    uint32_t max_incoming_streams =
-        std::max(max_incoming_streams_to_send + kMaxStreamsMinimumIncrement,
-                 static_cast<uint32_t>(max_incoming_streams_to_send *
-                                       kMaxStreamsMultiplier));
-    set_max_open_incoming_streams(max_incoming_streams);
-  }
+  // A small number of additional incoming streams beyond the limit should be
+  // allowed. This helps avoid early connection termination when FIN/RSTs for
+  // old streams are lost or arrive out of order.
+  // Use a minimum number of additional streams, or a percentage increase,
+  // whichever is larger.
+  uint32_t max_incoming_streams_to_send =
+      config_.GetMaxIncomingDynamicStreamsToSend();
+  uint32_t max_incoming_streams =
+      std::max(max_incoming_streams_to_send + kMaxStreamsMinimumIncrement,
+               static_cast<uint32_t>(max_incoming_streams_to_send *
+                                     kMaxStreamsMultiplier));
+  set_max_open_incoming_streams(max_incoming_streams);
 
   if (config_.HasReceivedInitialStreamFlowControlWindowBytes()) {
     // Streams which were created before the SHLO was received (0-RTT
     // requests) are now informed of the peer's initial flow control window.
     OnNewStreamFlowControlWindow(
         config_.ReceivedInitialStreamFlowControlWindowBytes());
   }
   if (config_.HasReceivedInitialSessionFlowControlWindowBytes()) {
     OnNewSessionFlowControlWindow(
         config_.ReceivedInitialSessionFlowControlWindowBytes());
@@ skipping 367 matching lines @@
 
 size_t QuicSession::MaxAvailableStreams() const {
   return max_open_incoming_streams_ * kMaxAvailableStreamsMultiplier;
 }
 
 bool QuicSession::IsIncomingStream(QuicStreamId id) const {
   return id % 2 != next_outgoing_stream_id_ % 2;
 }
 
 }  // namespace net