net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/stream_socket.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_SOCKET_STREAM_SOCKET_H_
 #define NET_SOCKET_STREAM_SOCKET_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 61 matching lines @@
   // reasons.  This call is generally forwarded to a basic TCPClientSocket*,
   // where a UseHistory can be updated.
   virtual void SetSubresourceSpeculation() = 0;
   virtual void SetOmniboxSpeculation() = 0;
 
   // Returns true if the socket ever had any reads or writes.  StreamSockets
   // layered on top of transport sockets should return if their own Read() or
   // Write() methods had been called, not the underlying transport's.
   virtual bool WasEverUsed() const = 0;
 
-  // TODO(jri): Clean up -- remove this method.
-  // Returns true if the underlying transport socket is using TCP FastOpen.
-  // TCP FastOpen is an experiment with sending data in the TCP SYN packet.
-  virtual bool UsingTCPFastOpen() const = 0;
-
   // TODO(jri): Clean up -- rename to a more general EnableAutoConnectOnWrite.
   // Enables use of TCP FastOpen for the underlying transport socket.
   virtual void EnableTCPFastOpenIfSupported() {}
 
   // Returns true if NPN was negotiated during the connection of this socket.
   virtual bool WasNpnNegotiated() const = 0;
 
   // Returns the protocol negotiated via NPN for this socket, or
   // kProtoUnknown will be returned if NPN is not applicable.
   virtual NextProto GetNegotiatedProtocol() const = 0;
@@ skipping 57 matching lines @@
     // identify the motivation.
     bool omnibox_speculation_;
     bool subresource_speculation_;
     DISALLOW_COPY_AND_ASSIGN(UseHistory);
   };
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_STREAM_SOCKET_H_