Update from https://crrev.com/311076

net/quic/quic_crypto_stream.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_crypto_stream.h"
 
 #include <string>
 
 #include "base/strings/string_piece.h"
 #include "net/quic/crypto/crypto_handshake.h"
 #include "net/quic/crypto/crypto_utils.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_session.h"
 #include "net/quic/quic_utils.h"
 
 using std::string;
 using base::StringPiece;
 
 namespace net {
 
 #define ENDPOINT (session()->is_server() ? "Server: " : " Client: ")
 
 QuicCryptoStream::QuicCryptoStream(QuicSession* session)
     : ReliableQuicStream(kCryptoStreamId, session),
       encryption_established_(false),
       handshake_confirmed_(false) {
   crypto_framer_.set_visitor(this);
-  if (version() < QUIC_VERSION_21) {
-    // Prior to QUIC_VERSION_21 the crypto stream is not subject to any flow
-    // control.
-    DisableFlowControl();
-  }
   // The crypto stream is exempt from connection level flow control.
   DisableConnectionFlowControlForThisStream();
 }
 
 void QuicCryptoStream::OnError(CryptoFramer* framer) {
   DLOG(WARNING) << "Error processing crypto data: "
                 << QuicUtils::ErrorToString(framer->error());
 }
 
 void QuicCryptoStream::OnHandshakeMessage(
@@ skipping 47 matching lines @@
       result_len,
       result);
 }
 
 const QuicCryptoNegotiatedParameters&
 QuicCryptoStream::crypto_negotiated_params() const {
   return crypto_negotiated_params_;
 }
 
 }  // namespace net