media: Make MediaKeys ref-counted.

media/cdm/ppapi/external_clear_key/clear_key_cdm.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 MEDIA_CDM_PPAPI_EXTERNAL_CLEAR_KEY_CLEAR_KEY_CDM_H_
 #define MEDIA_CDM_PPAPI_EXTERNAL_CLEAR_KEY_CLEAR_KEY_CDM_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 127 matching lines @@
 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 
   void StartFileIOTest();
 
   // Callback for CDM File IO test.
   void OnFileIOTestComplete(bool success);
 
   // Keep track of the last session created.
   void SetSessionId(const std::string& session_id);
 
-  AesDecryptor decryptor_;
+  scoped_refptr<AesDecryptor> decryptor_;
 
   ClearKeyCdmHost* host_;
 
   const std::string key_system_;
 
   std::string last_session_id_;
   std::string next_renewal_message_;
 
   // In order to simulate LoadSession(), CreateSession() and then
   // UpdateSession() will be called to create a session with known keys.
@@ skipping 46 matching lines @@
   scoped_ptr<CdmVideoDecoder> video_decoder_;
 
   scoped_ptr<FileIOTestRunner> file_io_test_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearKeyCdm);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CDM_PPAPI_EXTERNAL_CLEAR_KEY_CLEAR_KEY_CDM_H_