[Chromoting] GetHostAttributes with tests

remoting/host/directx_attributes.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.
 
-#include "remoting/protocol/ice_config.h"
+#ifndef REMOTING_HOST_DIRECTX_ATTRIBUTES_H_
+#define REMOTING_HOST_DIRECTX_ATTRIBUTES_H_
 
 namespace remoting {
-namespace protocol {
+void RegisterDirectxAttributes();
+}  // namespace remoting
 
-IceConfig::IceConfig() {}
-IceConfig::IceConfig(const IceConfig& other) = default;
-IceConfig::~IceConfig() {}
-
-}  // namespace protocol
-}  // namespace remoting
+#endif  // REMOTING_HOST_DIRECTX_ATTRIBUTES_H_