Update from https://crrev.com/311076

net/quic/crypto/crypto_protocol.h

 // 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.
 
 #ifndef NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 #define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 
 #include <string>
 
 #include "net/base/net_export.h"
@@ skipping 91 matching lines @@
 const QuicTag kSNI  = TAG('S', 'N', 'I', '\0');  // Server name
                                                  // indication
 const QuicTag kPUBS = TAG('P', 'U', 'B', 'S');   // Public key values
 const QuicTag kSCID = TAG('S', 'C', 'I', 'D');   // Server config id
 const QuicTag kORBT = TAG('O', 'B', 'I', 'T');   // Server orbit.
 const QuicTag kPDMD = TAG('P', 'D', 'M', 'D');   // Proof demand.
 const QuicTag kPROF = TAG('P', 'R', 'O', 'F');   // Proof (signature).
 const QuicTag kCCS  = TAG('C', 'C', 'S', 0);     // Common certificate set
 const QuicTag kCCRT = TAG('C', 'C', 'R', 'T');   // Cached certificate
 const QuicTag kEXPY = TAG('E', 'X', 'P', 'Y');   // Expiry
-// TODO(rjshade): Remove kIFCW when removing QUIC_VERSION_19.
-const QuicTag kIFCW = TAG('I', 'F', 'C', 'W');   // Initial flow control receive
-                                                 // window.
 const QuicTag kSFCW = TAG('S', 'F', 'C', 'W');   // Initial stream flow control
                                                  // receive window.
 const QuicTag kCFCW = TAG('C', 'F', 'C', 'W');   // Initial session/connection
                                                  // flow control receive window.
 const QuicTag kUAID = TAG('U', 'A', 'I', 'D');   // Client's User Agent ID.
 
 // Rejection tags
 const QuicTag kRREJ = TAG('R', 'R', 'E', 'J');   // Reasons for server sending
                                                  // rejection message tag.
 
@@ skipping 50 matching lines @@
 // amplification factor of any mirror DoS attack.
 //
 // A client may pad an inchoate client hello to a size larger than
 // kClientHelloMinimumSize to make it more likely to receive a complete
 // rejection message.
 const size_t kClientHelloMinimumSize = 1024;
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_