Rather than passing initial_flow_control_window all the way down the

net/quic/crypto/quic_crypto_client_config.cc

 // Copyright 2013 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/crypto/quic_crypto_client_config.h"
 
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "net/quic/crypto/cert_compressor.h"
 #include "net/quic/crypto/chacha20_poly1305_encrypter.h"
@@ skipping 328 matching lines @@
       hashes.push_back(QuicUtils::FNV1a_64_Hash(i->data(), i->size()));
     }
     out->SetVector(kCCRT, hashes);
   }
 }
 
 QuicErrorCode QuicCryptoClientConfig::FillClientHello(
     const QuicServerId& server_id,
     QuicConnectionId connection_id,
     const QuicVersion preferred_version,
-    uint32 initial_flow_control_window_bytes,
     const CachedState* cached,
     QuicWallTime now,
     QuicRandom* rand,
     const ChannelIDKey* channel_id_key,
     QuicCryptoNegotiatedParameters* out_params,
     CryptoHandshakeMessage* out,
     string* error_details) const {
   DCHECK(error_details != NULL);
 
   FillInchoateClientHello(server_id, preferred_version, cached,
                           out_params, out);
 
-  // Set initial receive window for flow control.
-  out->SetValue(kIFCW, initial_flow_control_window_bytes);
-
   const CryptoHandshakeMessage* scfg = cached->GetServerConfig();
   if (!scfg) {
     // This should never happen as our caller should have checked
     // cached->IsComplete() before calling this function.
     *error_details = "Handshake not ready";
     return QUIC_CRYPTO_INTERNAL_ERROR;
   }
 
   StringPiece scid;
   if (!scfg->GetStringPiece(kSCID, &scid)) {
@@ skipping 373 matching lines @@
     return;
   }
 
   // Update canonical version to point at the "most recent" entry.
   canonical_server_map_[suffix_server_id] = server_id;
 
   server_state->InitializeFrom(*canonical_state);
 }
 
 }  // namespace net