Revert of Renaming Gnubby and RemoteSecurityKey files/classes/members

remoting/host/security_key/security_key_auth_handler_mac.cc

Index: remoting/host/security_key/security_key_auth_handler_mac.cc
diff --git a/remoting/host/security_key/security_key_auth_handler_mac.cc b/remoting/host/security_key/security_key_auth_handler_mac.cc
deleted file mode 100644
index ac5a15df0b72f0acbf32cc2413063d552d8725da..0000000000000000000000000000000000000000
--- a/remoting/host/security_key/security_key_auth_handler_mac.cc
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "remoting/host/security_key/security_key_auth_handler.h"
-
-#include "base/logging.h"
-
-namespace remoting {
-
-std::unique_ptr<SecurityKeyAuthHandler> SecurityKeyAuthHandler::Create(
-    ClientSessionDetails* client_session_details,
-    const SendMessageCallback& send_message_callback) {
-  return nullptr;
-}
-
-}  // namespace remoting