diff --git a/content/media/TextTrack.cpp b/content/media/TextTrack.cpp
index cb09e4945d2a..912f0d536dba 100644
--- a/content/media/TextTrack.cpp
+++ b/content/media/TextTrack.cpp
@@ -115,12 +115,6 @@ TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv)
   SetDirty();
 }
 
-void
-TextTrack::CueChanged(TextTrackCue& aCue)
-{
-  //XXX: Implement Cue changed. Bug 867823.
-}
-
 void
 TextTrack::UpdateActiveCueList()
 {
diff --git a/content/media/TextTrack.h b/content/media/TextTrack.h
index b13a02f03c28..95b552e254df 100644
--- a/content/media/TextTrack.h
+++ b/content/media/TextTrack.h
@@ -111,7 +111,6 @@ public:
 
   void AddCue(TextTrackCue& aCue);
   void RemoveCue(TextTrackCue& aCue, ErrorResult& aRv);
-  void CueChanged(TextTrackCue& aCue);
   void SetDirty() { mDirty = true; }
 
   TextTrackList* GetTextTrackList();
diff --git a/content/media/TextTrackCue.cpp b/content/media/TextTrackCue.cpp
index 612867f0ac20..93bde559541b 100644
--- a/content/media/TextTrackCue.cpp
+++ b/content/media/TextTrackCue.cpp
@@ -162,15 +162,7 @@ TextTrackCue::SetRegion(TextTrackRegion* aRegion)
   }
   mRegion = aRegion;
   mReset = true;
-  CueChanged();
 }
 
-void
-TextTrackCue::CueChanged()
-{
-  if (mTrack) {
-    mTrack->CueChanged(*this);
-  }
-}
 } // namespace dom
 } // namespace mozilla
diff --git a/content/media/TextTrackCue.h b/content/media/TextTrackCue.h
index 757f13beb919..674b69893c58 100644
--- a/content/media/TextTrackCue.h
+++ b/content/media/TextTrackCue.h
@@ -75,7 +75,6 @@ public:
     }
 
     mId = aId;
-    CueChanged();
   }
 
   double StartTime() const
@@ -91,7 +90,6 @@ public:
 
     mStartTime = aStartTime;
     mReset = true;
-    CueChanged();
   }
 
   double EndTime() const
@@ -107,7 +105,6 @@ public:
 
     mEndTime = aEndTime;
     mReset = true;
-    CueChanged();
   }
 
   bool PauseOnExit()
@@ -122,7 +119,6 @@ public:
     }
 
     mPauseOnExit = aPauseOnExit;
-    CueChanged();
   }
 
   TextTrackRegion* GetRegion();
@@ -141,7 +137,6 @@ public:
 
     mReset = true;
     mVertical = aVertical;
-    CueChanged();
   }
 
   bool SnapToLines()
@@ -157,7 +152,6 @@ public:
 
     mReset = true;
     mSnapToLines = aSnapToLines;
-    CueChanged();
   }
 
   void GetLine(OwningLongOrAutoKeyword& aLine) const
@@ -175,13 +169,11 @@ public:
         (mLineIsAutoKeyword || (aLine.GetAsLong() != mLineLong))) {
       mLineIsAutoKeyword = false;
       mLineLong = aLine.GetAsLong();
-      CueChanged();
       mReset = true;
       return;
     }
     if (aLine.IsAutoKeyword() && !mLineIsAutoKeyword) {
       mLineIsAutoKeyword = true;
-      CueChanged();
       mReset = true;
     }
   }
@@ -203,7 +195,6 @@ public:
 
     mReset = true;
     mLineAlign = aLineAlign;
-    CueChanged();
   }
 
   int32_t Position() const
@@ -224,7 +215,6 @@ public:
 
     mReset = true;
     mPosition = aPosition;
-    CueChanged();
   }
 
   AlignSetting PositionAlign() const
@@ -244,7 +234,6 @@ public:
 
     mReset = true;
     mPositionAlign = aPositionAlign;
-    CueChanged();
   }
 
   int32_t Size() const
@@ -265,7 +254,6 @@ public:
 
     mReset = true;
     mSize = aSize;
-    CueChanged();
   }
 
   AlignSetting Align() const
@@ -281,7 +269,6 @@ public:
 
     mReset = true;
     mAlign = aAlign;
-    CueChanged();
   }
 
   void GetText(nsAString& aText) const
@@ -297,7 +284,6 @@ public:
 
     mReset = true;
     mText = aText;
-    CueChanged();
   }
 
   IMPL_EVENT_HANDLER(enter)
@@ -343,7 +329,6 @@ public:
   void SetTrackElement(HTMLTrackElement* aTrackElement);
 
 private:
-  void CueChanged();
   void SetDefaultCueSettings();
   nsresult StashDocument(nsISupports* aGlobal);