net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/ssl_client_socket_openssl.cc

Index: net/socket/ssl_client_socket_openssl.cc
diff --git a/net/socket/ssl_client_socket_openssl.cc b/net/socket/ssl_client_socket_openssl.cc
index 70c79ae0ef1d67c8bb0aa7b000880fce791b82ae..76cf9b5b0154d6d08e37850f0183ef411a8bb008 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -766,14 +766,6 @@ bool SSLClientSocketOpenSSL::WasEverUsed() const {
   return was_ever_used_;
 }
 
-bool SSLClientSocketOpenSSL::UsingTCPFastOpen() const {
-  if (transport_.get() && transport_->socket())
-    return transport_->socket()->UsingTCPFastOpen();
-
-  NOTREACHED();
-  return false;
-}
-
 bool SSLClientSocketOpenSSL::GetSSLInfo(SSLInfo* ssl_info) {
   ssl_info->Reset();
   if (server_cert_chain_->empty())