media: Reject promises and close sessions in MojoCdm destructor

media/mojo/clients/mojo_cdm.cc

Index: media/mojo/clients/mojo_cdm.cc
diff --git a/media/mojo/clients/mojo_cdm.cc b/media/mojo/clients/mojo_cdm.cc
index 10331747668601d06a161a7dd99a78182a7a1997..657659d8afabacf32810c73e2c3cb2d0fb390344 100644
--- a/media/mojo/clients/mojo_cdm.cc
+++ b/media/mojo/clients/mojo_cdm.cc
@@ -83,6 +83,10 @@ MojoCdm::~MojoCdm() {
       !decryptor_task_runner_->BelongsToCurrentThread() && decryptor_) {
     decryptor_task_runner_->DeleteSoon(FROM_HERE, decryptor_.release());
   }
+
+  // Reject any outstanding promises and close all the existing sessions.
+  cdm_promise_adapter_.Clear();
+  cdm_session_tracker_.CloseRemainingSessions(session_closed_cb_);
 }
 
 // Using base::Unretained(this) below is safe because |this| owns |remote_cdm_|,