media: Make MediaKeys ref-counted.

media/mojo/services/mojo_cdm_service.cc

 // 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.
 
 #include "media/mojo/services/mojo_cdm_service.h"
 
 #include "base/bind.h"
 #include "media/base/cdm_config.h"
 #include "media/base/cdm_factory.h"
 #include "media/base/cdm_key_information.h"
@@ skipping 120 matching lines @@
     mojo::InterfaceRequest<interfaces::Decryptor> decryptor) {
   NOTIMPLEMENTED();
 }
 
 CdmContext* MojoCdmService::GetCdmContext() {
   return cdm_->GetCdmContext();
 }
 
 void MojoCdmService::OnCdmCreated(int cdm_id,
                                   scoped_ptr<SimpleMojoCdmPromise> promise,
-                                  scoped_ptr<MediaKeys> cdm,
+                                  const scoped_refptr<MediaKeys>& cdm,
                                   const std::string& error_message) {
   // TODO(xhwang): This should not happen when KeySystemInfo is properly
   // populated. See http://crbug.com/469366
   if (!cdm || !context_) {
     promise->reject(MediaKeys::NOT_SUPPORTED_ERROR, 0, error_message);
     return;
   }
 
-  cdm_ = cdm.Pass();
+  cdm_ = cdm;
   cdm_id_ = cdm_id;
   context_->RegisterCdm(cdm_id_, this);
   promise->resolve();
 }
 
 void MojoCdmService::OnSessionMessage(const std::string& session_id,
                                       MediaKeys::MessageType message_type,
                                       const std::vector<uint8_t>& message,
                                       const GURL& legacy_destination_url) {
   DVLOG(2) << __FUNCTION__;
@@ skipping 31 matching lines @@
                                           MediaKeys::Exception exception,
                                           uint32_t system_code,
                                           const std::string& error_message) {
   DVLOG(2) << __FUNCTION__;
   client_->OnLegacySessionError(
       session_id, static_cast<interfaces::CdmException>(exception), system_code,
       error_message);
 }
 
 }  // namespace media