Deprecate FLAGS_quic_reloadable_flag_quic_flow_control_invariant.

net/quic/core/quic_flow_controller.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_CORE_QUIC_FLOW_CONTROLLER_H_
 #define NET_QUIC_CORE_QUIC_FLOW_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "net/quic/core/quic_packets.h"
 #include "net/quic/platform/api/quic_export.h"
@@ skipping 158 matching lines @@
 
   // Largest size the receive window can grow to.
   QuicByteCount receive_window_size_;
 
   // Upper limit on receive_window_size_;
   QuicByteCount receive_window_size_limit_;
 
   // Used to dynamically enable receive window auto-tuning.
   bool auto_tune_receive_window_;
 
-  // The session's flow controller.  null if this is stream id 0 or
-  // FLAGS_quic_reloadable_flag_quic_flow_control_invariant is false.
+  // The session's flow controller.  null if this is stream id 0.
   // Not owned.
   QuicFlowControllerInterface* session_flow_controller_;
 
   // Send window update when receive window size drops below this.
   QuicByteCount WindowUpdateThreshold();
 
   // Keep track of the last time we sent a BLOCKED frame. We should only send
   // another when the number of bytes we have sent has changed.
   QuicStreamOffset last_blocked_send_window_offset_;
 
   // Keep time of the last time a window update was sent.  We use this
   // as part of the receive window auto tuning.
   QuicTime prev_window_update_time_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicFlowController);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_QUIC_FLOW_CONTROLLER_H_