Separate the text track container from the media controls

Source/core/html/shadow/MediaControls.h

 /*
  * Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 50 matching lines @@
     void refreshClosedCaptionsButtonVisibility();
 
     void enteredFullscreen();
     void exitedFullscreen();
 
     void startedCasting();
     void stoppedCasting();
     void refreshCastButtonVisibility();
     void showOverlayCastButton();
 
-    TextTrackContainer* textTrackContainer();
-
     void mediaElementFocused();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit MediaControls(HTMLMediaElement&);
 
     void initializeControls();
 
     void makeOpaque();
@@ skipping 22 matching lines @@
     virtual bool isMediaControls() const override { return true; }
     virtual bool willRespondToMouseMoveEvents() override { return true; }
     virtual void defaultEventHandler(Event*) override;
     bool containsRelatedTarget(Event*);
 
     RawPtrWillBeMember<HTMLMediaElement> m_mediaElement;
 
     // Container for the media control elements.
     RawPtrWillBeMember<MediaControlPanelElement> m_panel;
 
-    // Container for the text track cues.
-    RawPtrWillBeMember<TextTrackContainer> m_textTrackContainer;
-
     // Media control elements.
     RawPtrWillBeMember<MediaControlOverlayPlayButtonElement> m_overlayPlayButton;
     RawPtrWillBeMember<MediaControlOverlayEnclosureElement> m_overlayEnclosure;
     RawPtrWillBeMember<MediaControlPlayButtonElement> m_playButton;
     RawPtrWillBeMember<MediaControlCurrentTimeDisplayElement> m_currentTimeDisplay;
     RawPtrWillBeMember<MediaControlTimelineElement> m_timeline;
     RawPtrWillBeMember<MediaControlMuteButtonElement> m_muteButton;
     RawPtrWillBeMember<MediaControlVolumeSliderElement> m_volumeSlider;
     RawPtrWillBeMember<MediaControlToggleClosedCaptionsButtonElement> m_toggleClosedCaptionsButton;
     RawPtrWillBeMember<MediaControlFullscreenButtonElement> m_fullScreenButton;
     RawPtrWillBeMember<MediaControlCastButtonElement> m_castButton;
     RawPtrWillBeMember<MediaControlCastButtonElement> m_overlayCastButton;
     RawPtrWillBeMember<MediaControlTimeRemainingDisplayElement> m_durationDisplay;
     RawPtrWillBeMember<MediaControlPanelEnclosureElement> m_enclosure;
 
     Timer<MediaControls> m_hideMediaControlsTimer;
     unsigned m_hideTimerBehaviorFlags;
     bool m_isMouseOverControls : 1;
     bool m_isPausedForScrubbing : 1;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(MediaControls, isMediaControls());
 
 }
 
 #endif