Revert of Renaming Gnubby and RemoteSecurityKey files/classes/members

remoting/host/security_key/gnubby_extension.cc

+// 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_extension.h"
+
+#include "base/memory/ptr_util.h"
+#include "remoting/host/security_key/gnubby_extension_session.h"
+
+namespace {
+// TODO(joedow): Update this once clients support sending a gnubby capabililty.
+//               Tracked via: crbug.com/587485
+const char kCapability[] = "";
+}
+
+namespace remoting {
+
+GnubbyExtension::GnubbyExtension() {}
+
+GnubbyExtension::~GnubbyExtension() {}
+
+std::string GnubbyExtension::capability() const {
+  return kCapability;
+}
+
+std::unique_ptr<HostExtensionSession> GnubbyExtension::CreateExtensionSession(
+    ClientSessionDetails* details,
+    protocol::ClientStub* client_stub) {
+  // TODO(joedow): Update this mechanism to allow for multiple sessions.  The
+  //               extension will only send messages through the initial
+  //               |client_stub| and |details| with the current design.
+  return base::WrapUnique(new GnubbyExtensionSession(details, client_stub));
+}
+
+}  // namespace remoting