Refactor MediaResource to be multi-stream capable

media/base/fake_text_track_stream.cc

Index: media/base/fake_text_track_stream.cc
diff --git a/media/base/fake_text_track_stream.cc b/media/base/fake_text_track_stream.cc
index 279fe39c55349b30b4b1bc102db158a7ef59cbbe..b522c3f3b4c9cc9be8c2d64554d63ff7ad33e73f 100644
--- a/media/base/fake_text_track_stream.cc
+++ b/media/base/fake_text_track_stream.cc
@@ -54,11 +54,6 @@ void FakeTextTrackStream::set_enabled(bool enabled, base::TimeDelta timestamp) {
   NOTIMPLEMENTED();
 }
 
-void FakeTextTrackStream::SetStreamStatusChangeCB(
-    const StreamStatusChangeCB& cb) {
-  NOTIMPLEMENTED();
-}
-
 void FakeTextTrackStream::SatisfyPendingRead(
     const base::TimeDelta& start,
     const base::TimeDelta& duration,