Improve caption button behavior for video player.

third_party/WebKit/Source/core/html/shadow/MediaControlElements.h

Index: third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
index d7d6ad4a376e9801f7513c6f67afbdf9345de4ca..f581f5496eebecfd866e199b497fa406d62ae5c5 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlElements.h
@@ -185,9 +185,6 @@ class MediaControlTextTrackListElement final : public MediaControlDivElement {
   // Creates the track element in the list when a valid track is passed in and
   // the "Off" item when the parameter is null.
   Element* createTextTrackListItem(TextTrack*);
-
-  void showTextTrackAtIndex(unsigned);
-  void disableShowingTextTracks();
 };
 
 // ----------------------------