Bug 1299393. Part 2 - remove unused functions. r=kaku

MozReview-Commit-ID: AfpKC88rC4n

--HG--
extra : rebase_source : 7fadadb11e309634acb0622f4bbf90696cf09f9d

dom/media/MediaDecoderStateMachine.h

@@ -483,11 +483,6 @@ protected:
   // decode thread.
   void DecodeError();
 
-  // Dispatches a task to the decode task queue to begin decoding metadata.
-  // This is threadsafe and can be called on any thread.
-  // The decoder monitor must be held.
-  nsresult EnqueueDecodeMetadataTask();
-
   // Dispatches a LoadedMetadataEvent.
   // This is threadsafe and can be called on any thread.
   // The decoder monitor must be held.