Revert of Renaming Gnubby and RemoteSecurityKey files/classes/members

remoting/host/security_key/gnubby_extension.h

+// 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.
+
+#ifndef REMOTING_HOST_SECURITY_KEY_GNUBBY_EXTENSION_H_
+#define REMOTING_HOST_SECURITY_KEY_GNUBBY_EXTENSION_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "remoting/host/host_extension.h"
+
+namespace remoting {
+
+class ClientSessionDetails;
+class HostExtensionSession;
+
+// GnubbyExtension extends HostExtension to enable Security Key support.
+class GnubbyExtension : public HostExtension {
+ public:
+  GnubbyExtension();
+  ~GnubbyExtension() override;
+
+  // HostExtension interface.
+  std::string capability() const override;
+  std::unique_ptr<HostExtensionSession> CreateExtensionSession(
+      ClientSessionDetails* client_session_details,
+      protocol::ClientStub* client_stub) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GnubbyExtension);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_SECURITY_KEY_GNUBBY_EXTENSION_H_