Fix GCC build for target 'all'

remoting/host/security_key/fake_security_key_ipc_server.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/fake_security_key_ipc_server.h"
 
 #include <cstdint>
 #include <memory>
 #include <string>
 
@@ skipping 112 matching lines @@
     base::TimeDelta initial_connect_timeout,
     const SecurityKeyAuthHandler::SendMessageCallback& send_message_callback,
     const base::Closure& connect_callback,
     const base::Closure& done_callback) {
   auto fake_ipc_server = base::MakeUnique<FakeSecurityKeyIpcServer>(
       connection_id, client_session_details, initial_connect_timeout,
       send_message_callback, connect_callback, done_callback);
 
   ipc_server_map_[connection_id] = fake_ipc_server->AsWeakPtr();
 
-  return fake_ipc_server;
+  return std::move(fake_ipc_server);
 }
 
 base::WeakPtr<FakeSecurityKeyIpcServer>
 FakeSecurityKeyIpcServerFactory::GetIpcServerObject(int connection_id) {
   return ipc_server_map_[connection_id];
 }
 
 }  // namespace remoting