diff --git a/dom/media/MediaManager.cpp b/dom/media/MediaManager.cpp
index d443e0054aa6..765bd2f2b752 100644
--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -800,17 +800,6 @@ public:
     }
   }
 
-  // let us intervene for direct listeners when someone does track.enabled = false
-  virtual void SetTrackEnabled(TrackID aTrackID, bool aEnabled) override
-  {
-    // We encapsulate the SourceMediaStream and TrackUnion into one entity, so
-    // we can handle the disabling at the SourceMediaStream
-
-    // We need to find the input track ID for output ID aTrackID, so we let the TrackUnion
-    // forward the request to the source and translate the ID
-    GetInputStream()->AsProcessedStream()->ForwardTrackEnabled(aTrackID, aEnabled);
-  }
-
   virtual DOMLocalMediaStream* AsDOMLocalMediaStream() override
   {
     return this;
diff --git a/dom/media/MediaStreamGraph.h b/dom/media/MediaStreamGraph.h
index 1fc405b1b871..0071111a1c57 100644
--- a/dom/media/MediaStreamGraph.h
+++ b/dom/media/MediaStreamGraph.h
@@ -1115,11 +1115,6 @@ public:
   virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) = 0;
   void SetAutofinishImpl(bool aAutofinish) { mAutofinish = aAutofinish; }
 
-  /**
-   * Forward SetTrackEnabled() to the input MediaStream(s) and translate the ID
-   */
-  virtual void ForwardTrackEnabled(TrackID aOutputID, bool aEnabled) {};
-
   // Only valid after MediaStreamGraphImpl::UpdateStreamOrder() has run.
   // A DelayNode is considered to break a cycle and so this will not return
   // true for echo loops, only for muted cycles.
diff --git a/dom/media/TrackUnionStream.cpp b/dom/media/TrackUnionStream.cpp
index 8310d22ac3ec..e4e844a4380c 100644
--- a/dom/media/TrackUnionStream.cpp
+++ b/dom/media/TrackUnionStream.cpp
@@ -149,18 +149,6 @@ TrackUnionStream::TrackUnionStream(DOMMediaStream* aWrapper) :
     }
   }
 
-  // Forward SetTrackEnabled(output_track_id, enabled) to the Source MediaStream,
-  // translating the output track ID into the correct ID in the source.
-  void TrackUnionStream::ForwardTrackEnabled(TrackID aOutputID, bool aEnabled)
-  {
-    for (int32_t i = mTrackMap.Length() - 1; i >= 0; --i) {
-      if (mTrackMap[i].mOutputTrackID == aOutputID) {
-        mTrackMap[i].mInputPort->GetSource()->
-          SetTrackEnabled(mTrackMap[i].mInputTrackID, aEnabled);
-      }
-    }
-  }
-
   uint32_t TrackUnionStream::AddTrack(MediaInputPort* aPort, StreamBuffer::Track* aTrack,
                     GraphTime aFrom)
   {
diff --git a/dom/media/TrackUnionStream.h b/dom/media/TrackUnionStream.h
index e9dd97922515..009a3fac1e40 100644
--- a/dom/media/TrackUnionStream.h
+++ b/dom/media/TrackUnionStream.h
@@ -21,10 +21,6 @@ public:
   virtual void RemoveInput(MediaInputPort* aPort) override;
   virtual void ProcessInput(GraphTime aFrom, GraphTime aTo, uint32_t aFlags) override;
 
-  // Forward SetTrackEnabled(output_track_id, enabled) to the Source MediaStream,
-  // translating the output track ID into the correct ID in the source.
-  virtual void ForwardTrackEnabled(TrackID aOutputID, bool aEnabled) override;
-
 protected:
   // Only non-ended tracks are allowed to persist in this map.
   struct TrackMapEntry {