Keep reference to CDM to avoid it's premature destruction

media/blink/cdm_session_adapter.cc

Index: media/blink/cdm_session_adapter.cc
diff --git a/media/blink/cdm_session_adapter.cc b/media/blink/cdm_session_adapter.cc
index fa5ee065719bb1aa533a3adbf7a31e4006b7696e..97d3f7aefef56af1b7acdbee575df7d6ac94e52d 100644
--- a/media/blink/cdm_session_adapter.cc
+++ b/media/blink/cdm_session_adapter.cc
@@ -123,8 +123,8 @@ void CdmSessionAdapter::RemoveSession(
   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 {