Keep reference to CDM to avoid it's premature destruction

media/blink/webcontentdecryptionmodule_impl.cc

 // 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.
 
 #include "media/blink/webcontentdecryptionmodule_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 83 matching lines @@
     size_t server_certificate_length,
     blink::WebContentDecryptionModuleResult result) {
   DCHECK(server_certificate);
   adapter_->SetServerCertificate(
       std::vector<uint8_t>(server_certificate,
                            server_certificate + server_certificate_length),
       std::unique_ptr<SimpleCdmPromise>(
           new CdmResultPromise<>(result, std::string())));
 }
 
-CdmContext* WebContentDecryptionModuleImpl::GetCdmContext() {
-  return adapter_->GetCdmContext();
+scoped_refptr<MediaKeys> WebContentDecryptionModuleImpl::GetCdm() {
+  return adapter_->GetCdm();
 }
 
 }  // namespace media