Bug 1190019: [MSE] P2. Remove cycle between TrackBuffersManager and MediaSourceDemuxer. r=gerald

dom/media/mediasource/TrackBuffersManager.cpp

@@ -105,7 +105,6 @@ TrackBuffersManager::TrackBuffersManager(dom::SourceBufferAttributes* aAttribute
   , mTaskQueue(aParentDecoder->GetDemuxer()->GetTaskQueue())
   , mSourceBufferAttributes(aAttributes)
   , mParentDecoder(new nsMainThreadPtrHolder<MediaSourceDecoder>(aParentDecoder, false /* strict */))
-  , mMediaSourceDemuxer(mParentDecoder->GetDemuxer())
   , mMediaSourceDuration(mTaskQueue, Maybe<double>(), "TrackBuffersManager::mMediaSourceDuration (Mirror)")
   , mAbort(false)
   , mEvictionThreshold(Preferences::GetUint("media.mediasource.eviction_threshold",

dom/media/mediasource/TrackBuffersManager.h

@@ -322,7 +322,6 @@ private:
   // Strong references to external objects.
   nsRefPtr<dom::SourceBufferAttributes> mSourceBufferAttributes;
   nsMainThreadPtrHandle<MediaSourceDecoder> mParentDecoder;
-  nsRefPtr<MediaSourceDemuxer> mMediaSourceDemuxer;
 
   // MediaSource duration mirrored from MediaDecoder on the main thread..
   Mirror<Maybe<double>> mMediaSourceDuration;