Rather than passing initial_flow_control_window all the way down the

net/quic/quic_client_session.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.
 //
 // A client specific QuicSession subclass.  This class owns the underlying
 // QuicConnection and QuicConnectionHelper objects.  The connection stores
 // a non-owning pointer to the helper so this session needs to ensure that
 // the helper outlives the connection.
 
 #ifndef NET_QUIC_QUIC_CLIENT_SESSION_H_
@@ skipping 80 matching lines @@
   // not |stream_factory|, which must outlive this session.
   // TODO(rch): decouple the factory from the session via a Delegate interface.
   QuicClientSession(QuicConnection* connection,
                     scoped_ptr<DatagramClientSocket> socket,
                     scoped_ptr<QuicDefaultPacketWriter> writer,
                     QuicStreamFactory* stream_factory,
                     QuicCryptoClientStreamFactory* crypto_client_stream_factory,
                     scoped_ptr<QuicServerInfo> server_info,
                     const QuicServerId& server_id,
                     const QuicConfig& config,
-                    uint32 max_flow_control_receive_window_bytes,
                     QuicCryptoClientConfig* crypto_config,
                     base::TaskRunner* task_runner,
                     NetLog* net_log);
-
   virtual ~QuicClientSession();
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Attempts to create a new stream.  If the stream can be
   // created immediately, returns OK.  If the open stream limit
   // has been reached, returns ERR_IO_PENDING, and |request|
   // will be added to the stream requets queue and will
   // be completed asynchronously.
@@ skipping 128 matching lines @@
   // on this session. Existing stream will continue to be processed.
   bool going_away_;
   base::WeakPtrFactory<QuicClientSession> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicClientSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CLIENT_SESSION_H_