net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/ssl_server_socket_nss.cc

Index: net/socket/ssl_server_socket_nss.cc
diff --git a/net/socket/ssl_server_socket_nss.cc b/net/socket/ssl_server_socket_nss.cc
index b19906d8d3f25e85c5b9d2cea0b3e661f8b3975c..8e02909cf54d52cecb8777d2806c3298166ee279 100644
--- a/net/socket/ssl_server_socket_nss.cc
+++ b/net/socket/ssl_server_socket_nss.cc
@@ -116,7 +116,6 @@ class SSLServerSocketNSS : public SSLServerSocket {
   void SetSubresourceSpeculation() override;
   void SetOmniboxSpeculation() override;
   bool WasEverUsed() const override;
-  bool UsingTCPFastOpen() const override;
   bool WasNpnNegotiated() const override;
   NextProto GetNegotiatedProtocol() const override;
   bool GetSSLInfo(SSLInfo* ssl_info) override;
@@ -386,10 +385,6 @@ bool SSLServerSocketNSS::WasEverUsed() const {
   return transport_socket_->WasEverUsed();
 }
 
-bool SSLServerSocketNSS::UsingTCPFastOpen() const {
-  return transport_socket_->UsingTCPFastOpen();
-}
-
 bool SSLServerSocketNSS::WasNpnNegotiated() const {
   NOTIMPLEMENTED();
   return false;