Update GnubbyAuthHandler to use the current session ID

remoting/host/security_key/gnubby_auth_handler_linux.cc

Index: remoting/host/security_key/gnubby_auth_handler_linux.cc
diff --git a/remoting/host/security_key/gnubby_auth_handler_linux.cc b/remoting/host/security_key/gnubby_auth_handler_linux.cc
index 5ba1ee2db4f11f9d011b8ec645620a42816b2a26..f84b0d330a54fde057a43a2ede78ffdec8059646 100644
--- a/remoting/host/security_key/gnubby_auth_handler_linux.cc
+++ b/remoting/host/security_key/gnubby_auth_handler_linux.cc
@@ -66,6 +66,7 @@ class GnubbyAuthHandlerLinux : public GnubbyAuthHandler {
                           const std::string& response) override;
   void SendErrorAndCloseConnection(int gnubby_connection_id) override;
   void SetSendMessageCallback(const SendMessageCallback& callback) override;
+  void SetSessionIdCallback(const SessionIdCallback& callback) override;
   size_t GetActiveConnectionCountForTest() const override;
   void SetRequestTimeoutForTest(base::TimeDelta timeout) override;
 
@@ -113,9 +114,10 @@ class GnubbyAuthHandlerLinux : public GnubbyAuthHandler {
 };
 
 std::unique_ptr<GnubbyAuthHandler> GnubbyAuthHandler::Create(
-    const SendMessageCallback& callback) {
+    const SendMessageCallback& send_message_callback,
+    const SessionIdCallback& session_id_callback) {
   std::unique_ptr<GnubbyAuthHandler> auth_handler(new GnubbyAuthHandlerLinux());
-  auth_handler->SetSendMessageCallback(callback);
+  auth_handler->SetSendMessageCallback(send_message_callback);
   return auth_handler;
 }
 
@@ -199,6 +201,12 @@ void GnubbyAuthHandlerLinux::SetSendMessageCallback(
   send_message_callback_ = callback;
 }
 
+void GnubbyAuthHandlerLinux::SetSessionIdCallback(
+    const SessionIdCallback& callback) {
+  // SessionIdCallback is not currently used for this platform.
+  NOTREACHED();
+}
+
 size_t GnubbyAuthHandlerLinux::GetActiveConnectionCountForTest() const {
   return active_sockets_.size();
 }