Refactor KeySystems code to call a function to populate the info.

content/renderer/media/crypto/key_systems_info.h

 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_INFO_H_
 #define CONTENT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_INFO_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+// TODO(ddorwin): Remove when AddKeySystems is removed.
+#include "content/public/common/key_system_info.h"
 
 namespace WebKit {
 class WebString;
 }
 
 namespace content {
 
 // TODO(ddorwin): Move registration to ContentClient.
-void RegisterKeySystems();
+void AddKeySystems(std::vector<KeySystemInfo>* key_systems_info);
 
 // Returns true if canPlayType should return an empty string for |key_system|.
 bool IsCanPlayTypeSuppressed(const std::string& key_system);
 
 // Returns the name that UMA will use for the given |key_system|.
 // This function can be called frequently. Hence this function should be
 // implemented not to impact performance and does not rely on the main
 // key system map.
 std::string KeySystemNameForUMAInternal(const WebKit::WebString& key_system);
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_CRYPTO_KEY_SYSTEMS_INFO_H_