Separate the text track container from the media controls

Source/core/html/shadow/MediaControls.h

Index: Source/core/html/shadow/MediaControls.h
diff --git a/Source/core/html/shadow/MediaControls.h b/Source/core/html/shadow/MediaControls.h
index e4b400674249c1a680dd41a7d714d5b5424f7f70..b59c9aa42f1bc58f87b8b4efad525b0c33674109 100644
--- a/Source/core/html/shadow/MediaControls.h
+++ b/Source/core/html/shadow/MediaControls.h
@@ -67,8 +67,6 @@ public:
     void refreshCastButtonVisibility();
     void showOverlayCastButton();
 
-    void updateTextTrackDisplay();
-
     void mediaElementFocused();
 
     DECLARE_VIRTUAL_TRACE();
@@ -100,8 +98,6 @@ private:
     // element in the page, it will be hidden.
     void tryShowOverlayCastButton();
 
-    void createTextTrackDisplay();
-
     // Node
     virtual bool isMediaControls() const override { return true; }
     virtual bool willRespondToMouseMoveEvents() override { return true; }
@@ -113,9 +109,6 @@ private:
     // Container for the media control elements.
     RawPtrWillBeMember<MediaControlPanelElement> m_panel;
 
-    // Container for the text track cues.
-    RawPtrWillBeMember<MediaControlTextTrackContainerElement> m_textDisplayContainer;
-
     // Media control elements.
     RawPtrWillBeMember<MediaControlOverlayPlayButtonElement> m_overlayPlayButton;
     RawPtrWillBeMember<MediaControlOverlayEnclosureElement> m_overlayEnclosure;