Keep reference to CDM to avoid it's premature destruction

media/blink/cdm_session_adapter.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 MEDIA_BLINK_CDM_SESSION_ADAPTER_H_
 #define MEDIA_BLINK_CDM_SESSION_ADAPTER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 72 matching lines @@
 
   // Closes the session specified by |session_id|.
   void CloseSession(const std::string& session_id,
                     std::unique_ptr<SimpleCdmPromise> promise);
 
   // Removes stored session data associated with the session specified by
   // |session_id|.
   void RemoveSession(const std::string& session_id,
                      std::unique_ptr<SimpleCdmPromise> promise);
 
-  // Returns the CdmContext associated with |media_keys_|.
-  // TODO(jrummell): Figure out lifetimes, as WMPI may still use the decryptor
-  // after WebContentDecryptionModule is freed. http://crbug.com/330324
-  CdmContext* GetCdmContext();
+  // Returns a reference to the CDM.
+  scoped_refptr<MediaKeys> GetCdm();
 
   // Returns the key system name.
   const std::string& GetKeySystem() const;
 
   // Returns a prefix to use for UMAs.
   const std::string& GetKeySystemUMAPrefix() const;
 
  private:
   friend class base::RefCounted<CdmSessionAdapter>;
 
@@ skipping 42 matching lines @@
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<CdmSessionAdapter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CdmSessionAdapter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_CDM_SESSION_ADAPTER_H_