Reorganizes Chromecast code to better reflect functional dependencies.

chromecast/shell/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_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_
-#define CHROMECAST_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_
-
-#include <vector>
-
-#include "content/public/renderer/key_system_info.h"
-
-namespace chromecast {
-namespace shell {
-
-// Adds a single key system by name.
-void AddKeySystemWithCodecs(
-    const std::string& key_system_name,
-    std::vector<content::KeySystemInfo>* concrete_key_systems);
-
-void AddChromecastKeySystems(
-    std::vector<content::KeySystemInfo>* key_systems_info);
-
-// TODO(gunsch): Remove when prefixed EME is removed.
-void AddChromecastPlatformKeySystems(
-    std::vector<content::KeySystemInfo>* key_systems_info);
-
-}  // namespace shell
-}  // namespace chromecast
-
-#endif  // CHROMECAST_SHELL_RENDERER_KEY_SYSTEMS_CAST_H_