net: remove UsingTCPFastOpen() method from StreamSocket class

net/socket/stream_socket.h

Index: net/socket/stream_socket.h
diff --git a/net/socket/stream_socket.h b/net/socket/stream_socket.h
index e2f9d3cd7907f5c0db1a29ab9290fb9c58b75457..98efcdafb9ba9560a98112f47a4a01691c004229 100644
--- a/net/socket/stream_socket.h
+++ b/net/socket/stream_socket.h
@@ -79,11 +79,6 @@ class NET_EXPORT_PRIVATE StreamSocket : public Socket {
   // 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() {}