Bug 1369422 - Simplify MediaStreamGraph::IsNonRealtime and make it not lock. r=jesup

MozReview-Commit-ID: HAHR97y6zfh

--HG--
extra : rebase_source : 2b258ccedbe40599acc62c8932682ac21784cce4

dom/media/MediaStreamGraph.cpp

@@ -4033,10 +4033,7 @@ MediaStreamGraph::ApplyAudioContextOperation(MediaStream* aDestinationStream,
 bool
 MediaStreamGraph::IsNonRealtime() const
 {
-  const MediaStreamGraphImpl* impl = static_cast<const MediaStreamGraphImpl*>(this);
-  MediaStreamGraphImpl* graph;
-
-  return !gGraphs.Get(uint32_t(impl->AudioChannel()), &graph) || graph != impl;
+  return !static_cast<const MediaStreamGraphImpl*>(this)->mRealtime;
 }
 
 void