Revert of Renaming Gnubby and RemoteSecurityKey files/classes/members

remoting/host/security_key/gnubby_auth_handler_mac.cc

Index: remoting/host/security_key/gnubby_auth_handler_mac.cc
diff --git a/remoting/host/security_key/gnubby_auth_handler_mac.cc b/remoting/host/security_key/gnubby_auth_handler_mac.cc
new file mode 100644
index 0000000000000000000000000000000000000000..09f7f7c6f6b521245ebac175f29984938a94d9ec
--- /dev/null
+++ b/remoting/host/security_key/gnubby_auth_handler_mac.cc
@@ -0,0 +1,17 @@
+// 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/gnubby_auth_handler.h"
+
+#include "base/logging.h"
+
+namespace remoting {
+
+std::unique_ptr<GnubbyAuthHandler> GnubbyAuthHandler::Create(
+    ClientSessionDetails* client_session_details,
+    const SendMessageCallback& send_message_callback) {
+  return nullptr;
+}
+
+}  // namespace remoting