From 4f7e431137caffc0c1cc8deee361893a7eabe70c Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Tue, 11 Dec 2018 23:17:50 +0100
Subject: Clear weak pointers in VTT shutdown observers.

---
 dom/html/TextTrackManager.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'dom/html/TextTrackManager.h')

diff --git a/dom/html/TextTrackManager.h b/dom/html/TextTrackManager.h
index d20707346..4ad1a57a7 100644
--- a/dom/html/TextTrackManager.h
+++ b/dom/html/TextTrackManager.h
@@ -170,11 +170,15 @@ private:
     {
       MOZ_ASSERT(NS_IsMainThread());
       if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
-        nsContentUtils::UnregisterShutdownObserver(this);
-        mManager->NotifyShutdown();
+        if (mManager) {
+          mManager->NotifyShutdown();
+        }
+        Unregister();
       }
       return NS_OK;
     }
+    
+    void Unregister();
 
   private:
     ~ShutdownObserverProxy() {};
-- 
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