--- a/dom/media/MediaResource.cpp
+++ b/dom/media/MediaResource.cpp
@@ -104,20 +104,18 @@ ChannelMediaResource::ChannelMediaResour
   , mChannelStatistics(aStatistics)
   , mIgnoreResume(false)
   , mSuspendAgent(mChannel)
 {
 }
 
 ChannelMediaResource::~ChannelMediaResource()
 {
-  if (mListener) {
-    // Kill its reference to us since we're going away
-    mListener->Revoke();
-  }
+  MOZ_ASSERT(!mChannel);
+  MOZ_ASSERT(!mListener);
 }
 
 // ChannelMediaResource::Listener just observes the channel and
 // forwards notifications to the ChannelMediaResource. We use multiple
 // listener objects so that when we open a new stream for a seek we can
 // disconnect the old listener from the ChannelMediaResource and hook up
 // a new listener, so notifications from the old channel are discarded
 // and don't confuse us.