--- a/dom/webidl/SourceBuffer.webidl
+++ b/dom/webidl/SourceBuffer.webidl
@@ -19,31 +19,26 @@ enum SourceBufferAppendMode {
 interface SourceBuffer : EventTarget {
   [SetterThrows]
   attribute SourceBufferAppendMode mode;
   readonly attribute boolean updating;
   [Throws]
   readonly attribute TimeRanges buffered;
   [SetterThrows]
   attribute double timestampOffset;
-  //readonly attribute AudioTrackList audioTracks;
-  //readonly attribute VideoTrackList videoTracks;
-  //readonly attribute TextTrackList textTracks;
   [SetterThrows]
   attribute double appendWindowStart;
   [SetterThrows]
   attribute unrestricted double appendWindowEnd;
   attribute EventHandler onupdatestart;
   attribute EventHandler onupdate;
   attribute EventHandler onupdateend;
   attribute EventHandler onerror;
   attribute EventHandler onabort;
   [Throws]
   void appendBuffer(ArrayBuffer data);
   [Throws]
   void appendBuffer(ArrayBufferView data);
-  //[Throws]
-  //void appendStream(Stream stream, [EnforceRange] optional unsigned long long maxSize);
   [Throws]
   void abort();
   [Throws]
   void remove(double start, unrestricted double end);
 };