Load CMA backend from shared library

chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.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_MEDIA_CMA_IPC_STREAMER_DECRYPT_CONFIG_MARSHALLER_H_
 #define CHROMECAST_MEDIA_CMA_IPC_STREAMER_DECRYPT_CONFIG_MARSHALLER_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace media {
 class DecryptConfig;
 }
 
 namespace chromecast {
 namespace media {
+class DecryptConfig;
 class MediaMessage;
 
 class DecryptConfigMarshaller {
  public:
   // Writes the serialized structure of |config| into |msg|.
-  static void Write(
-      const ::media::DecryptConfig& config, MediaMessage* msg);
+  static void Write(const DecryptConfig& config, MediaMessage* msg);
 
   // Returns a DecryptConfig from its serialized structure.
-  static scoped_ptr< ::media::DecryptConfig> Read(MediaMessage* msg);
+  static scoped_ptr<DecryptConfig> Read(MediaMessage* msg);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_IPC_STREAMER_DECRYPT_CONFIG_MARSHALLER_H_