diff --git a/dom/media/MediaStreamGraph.cpp b/dom/media/MediaStreamGraph.cpp
index 76b2c322e99d..14abd59eaf56 100644
--- a/dom/media/MediaStreamGraph.cpp
+++ b/dom/media/MediaStreamGraph.cpp
@@ -2476,20 +2476,6 @@ SourceMediaStream::EndAllTrackAndFinish()
   // we will call NotifyEvent() to let GetUserMedia know
 }
 
-StreamTime
-SourceMediaStream::GetBufferedTicks(TrackID aID)
-{
-  StreamBuffer::Track* track  = mBuffer.FindTrack(aID);
-  if (track) {
-    MediaSegment* segment = track->GetSegment();
-    if (segment) {
-      return segment->GetDuration() -
-          GraphTimeToStreamTime(GraphImpl()->mStateComputedTime);
-    }
-  }
-  return 0;
-}
-
 void
 SourceMediaStream::RegisterForAudioMixing()
 {
diff --git a/dom/media/MediaStreamGraph.h b/dom/media/MediaStreamGraph.h
index bd549124eb39..01b5393484bd 100644
--- a/dom/media/MediaStreamGraph.h
+++ b/dom/media/MediaStreamGraph.h
@@ -842,17 +842,6 @@ public:
    */
   void EndAllTrackAndFinish();
 
-  /**
-   * Note: Only call from Media Graph thread (eg NotifyPull)
-   *
-   * Returns amount of time (data) that is currently buffered in the track,
-   * assuming playout via PlayAudio or via a TrackUnion - note that
-   * NotifyQueuedTrackChanges() on a SourceMediaStream will occur without
-   * any "extra" buffering, but NotifyQueued TrackChanges() on a TrackUnion
-   * will be buffered.
-   */
-  StreamTime GetBufferedTicks(TrackID aID);
-
   void RegisterForAudioMixing();
 
   // XXX need a Reset API