net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/socket_test_util.cc

Index: net/socket/socket_test_util.cc
diff --git a/net/socket/socket_test_util.cc b/net/socket/socket_test_util.cc
index 57a5163dcc63636c17ba62cd61e00ac668c5b386..e078b0df2196163cebeebc4c86420186bac24d51 100644
--- a/net/socket/socket_test_util.cc
+++ b/net/socket/socket_test_util.cc
@@ -1022,10 +1022,6 @@ bool MockTCPClientSocket::WasEverUsed() const {
   return was_used_to_convey_data_;
 }
 
-bool MockTCPClientSocket::UsingTCPFastOpen() const {
-  return false;
-}
-
 void MockTCPClientSocket::EnableTCPFastOpenIfSupported() {
   EXPECT_FALSE(IsConnected()) << "Can't enable fast open after connect.";
 
@@ -1200,10 +1196,6 @@ bool MockSSLClientSocket::WasEverUsed() const {
   return transport_->socket()->WasEverUsed();
 }
 
-bool MockSSLClientSocket::UsingTCPFastOpen() const {
-  return transport_->socket()->UsingTCPFastOpen();
-}
-
 int MockSSLClientSocket::GetPeerAddress(IPEndPoint* address) const {
   return transport_->socket()->GetPeerAddress(address);
 }