Keep reference to CDM to avoid it's premature destruction

media/blink/cdm_session_adapter.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/blink/cdm_session_adapter.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 105 matching lines @@
     std::unique_ptr<SimpleCdmPromise> promise) {
   cdm_->CloseSession(session_id, std::move(promise));
 }
 
 void CdmSessionAdapter::RemoveSession(
     const std::string& session_id,
     std::unique_ptr<SimpleCdmPromise> promise) {
   cdm_->RemoveSession(session_id, std::move(promise));
 }
 
-CdmContext* CdmSessionAdapter::GetCdmContext() {
-  return cdm_->GetCdmContext();
+scoped_refptr<MediaKeys> CdmSessionAdapter::GetCdm() {
+  return cdm_;
 }
 
 const std::string& CdmSessionAdapter::GetKeySystem() const {
   return key_system_;
 }
 
 const std::string& CdmSessionAdapter::GetKeySystemUMAPrefix() const {
   DCHECK(!key_system_uma_prefix_.empty());
   return key_system_uma_prefix_;
 }
@@ skipping 84 matching lines @@
   // Note: This leaks memory, which is expected behavior.
   base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
       GetKeySystemUMAPrefix() + kTimeToCreateCdmUMAName,
       base::TimeDelta::FromMilliseconds(1), base::TimeDelta::FromSeconds(10),
       50, base::HistogramBase::kUmaTargetedHistogramFlag);
 
   histogram->AddTime(time);
 }
 
 }  // namespace media