Revert of Renaming Gnubby and RemoteSecurityKey files/classes/members

remoting/host/security_key/security_key_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/security_key_extension.h"
-
-#include "base/memory/ptr_util.h"
-#include "remoting/host/security_key/security_key_extension_session.h"
-
-namespace {
-// TODO(joedow): Update this once clients support sending a security key
-//               capabililty.  Tracked via: crbug.com/587485
-const char kCapability[] = "";
-}
-
-namespace remoting {
-
-SecurityKeyExtension::SecurityKeyExtension() {}
-
-SecurityKeyExtension::~SecurityKeyExtension() {}
-
-std::string SecurityKeyExtension::capability() const {
-  return kCapability;
-}
-
-std::unique_ptr<HostExtensionSession>
-SecurityKeyExtension::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 SecurityKeyExtensionSession(details, client_stub));
-}
-
-}  // namespace remoting