--- a/dom/media/MediaDecoderStateMachine.h
+++ b/dom/media/MediaDecoderStateMachine.h
@@ -748,17 +748,16 @@ private:
 
 public:
   AbstractCanonical<media::TimeIntervals>* CanonicalBuffered() const;
 
   AbstractCanonical<media::NullableTimeUnit>* CanonicalDuration()
   {
     return &mDuration;
   }
-  AbstractCanonical<bool>* CanonicalIsShutdown() { return &mIsShutdown; }
   AbstractCanonical<NextFrameStatus>* CanonicalNextFrameStatus()
   {
     return &mNextFrameStatus;
   }
   AbstractCanonical<media::TimeUnit>* CanonicalCurrentPosition()
   {
     return &mCurrentPosition;
   }