Bug 1258410: [MSE] P1. Abort if mInputDemuxer has been reset. r=gerald

MozReview-Commit-ID: 3irSFFSnXFp

--HG--
extra : rebase_source : a10d067d54ad3f4a67027efae50282270732c265

dom/media/mediasource/TrackBuffersManager.cpp

@@ -879,9 +879,12 @@ TrackBuffersManager::OnDemuxerInitDone(nsresult)
   MOZ_ASSERT(OnTaskQueue());
   mDemuxerInitRequest.Complete();
 
-  // mInputDemuxer shouldn't have been destroyed while a demuxer init/reset
-  // request was being processed. See bug 1239983.
-  MOZ_DIAGNOSTIC_ASSERT(mInputDemuxer);
+  if (!mInputDemuxer) {
+    // mInputDemuxer shouldn't have been destroyed while a demuxer init/reset
+    // request was being processed. See bug 1239983.
+    NS_WARNING("mInputDemuxer has been destroyed");
+    RejectAppend(NS_ERROR_ABORT, __func__);
+  }
 
   MediaInfo info;