Simplify/Cleanup MediaClient

chromecast/renderer/key_systems_cast.h

-// Copyright 2014 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 CHROMECAST_RENDERER_KEY_SYSTEMS_CAST_H_
-#define CHROMECAST_RENDERER_KEY_SYSTEMS_CAST_H_
-
-#include <memory>
-#include <vector>
-
-namespace media {
-class KeySystemProperties;
-}
-
-namespace chromecast {
-namespace shell {
-
-void AddChromecastKeySystems(
-    std::vector<std::unique_ptr<::media::KeySystemProperties>>*
-        key_systems_properties,
-    bool enable_persistent_license_support,
-    bool force_software_crypto);
-
-}  // namespace shell
-}  // namespace chromecast
-
-#endif  // CHROMECAST_RENDERER_KEY_SYSTEMS_CAST_H_