Deprecate FLAGS_quic_disable_pre_30. Remove QUIC versions [25-29].

net/quic/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/quic_session.h"
 
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "net/quic/crypto/proof_verifier.h"
@@ skipping 683 matching lines @@
   }
 
   available_streams_.erase(stream_id);
 
   if (!MaybeIncreaseLargestPeerStreamId(stream_id)) {
     return nullptr;
   }
   // Check if the new number of open streams would cause the number of
   // open streams to exceed the limit.
   if (GetNumOpenIncomingStreams() >= max_open_incoming_streams()) {
-    if (connection()->version() <= QUIC_VERSION_27) {
-      connection()->CloseConnection(
-          QUIC_TOO_MANY_OPEN_STREAMS, "Old style stream rejection",
-          ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
-    } else {
-      // Refuse to open the stream.
-      SendRstStream(stream_id, QUIC_REFUSED_STREAM, 0);
-    }
+    // Refuse to open the stream.
+    SendRstStream(stream_id, QUIC_REFUSED_STREAM, 0);
     return nullptr;
   }
 
   return CreateIncomingDynamicStream(stream_id);
 }
 
 void QuicSession::set_max_open_incoming_streams(
     size_t max_open_incoming_streams) {
   DVLOG(1) << "Setting max_open_incoming_streams_ to "
            << max_open_incoming_streams;
@@ skipping 111 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