net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/socks_client_socket.cc

Index: net/socket/socks_client_socket.cc
diff --git a/net/socket/socks_client_socket.cc b/net/socket/socks_client_socket.cc
index ce5daac121e4006ef914610de1fa8d1d7228ad7f..0f6e925596e9ef4bae8b8c3db338a4bedc9c6c62 100644
--- a/net/socket/socks_client_socket.cc
+++ b/net/socket/socks_client_socket.cc
@@ -142,14 +142,6 @@ bool SOCKSClientSocket::WasEverUsed() const {
   return was_ever_used_;
 }
 
-bool SOCKSClientSocket::UsingTCPFastOpen() const {
-  if (transport_.get() && transport_->socket()) {
-    return transport_->socket()->UsingTCPFastOpen();
-  }
-  NOTREACHED();
-  return false;
-}
-
 bool SOCKSClientSocket::WasNpnNegotiated() const {
   if (transport_.get() && transport_->socket()) {
     return transport_->socket()->WasNpnNegotiated();