Rather than passing initial_flow_control_window all the way down the

net/quic/quic_client_session_base.h

 // Copyright 2014 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_QUIC_CLIENT_SESSION_BASE_H_
 #define NET_QUIC_QUIC_CLIENT_SESSION_BASE_H_
 
 #include "net/quic/quic_crypto_client_stream.h"
 #include "net/quic/quic_session.h"
 
 namespace net {
 
 // Base class for all client-specific QuicSession subclasses.
 class NET_EXPORT_PRIVATE QuicClientSessionBase : public QuicSession {
  public:
   QuicClientSessionBase(QuicConnection* connection,
-                        uint32 max_flow_control_receive_window_bytes,
                         const QuicConfig& config);
 
   virtual ~QuicClientSessionBase();
 
   // Called when the proof in |cached| is marked valid.  If this is a secure
   // QUIC session, then this will happen only after the proof verifier
   // completes.  If this is an insecure QUIC connection, this will happen
   // as soon as a valid config is discovered (either from the cache or
   // from the server).
   virtual void OnProofValid(
       const QuicCryptoClientConfig::CachedState& cached) = 0;
 
   // Called when proof verification details become available, either because
   // proof verification is complete, or when cached details are used. This
   // will only be called for secure QUIC connections.
   virtual void OnProofVerifyDetailsAvailable(
       const ProofVerifyDetails& verify_details) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicClientSessionBase);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CLIENT_SESSION_BASE_H_