Start separating the text track container from the media controls

Source/core/html/shadow/MediaControlElements.h

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 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.
@@ skipping 218 matching lines @@
 // ----------------------------
 
 class MediaControlCurrentTimeDisplayElement final : public MediaControlTimeDisplayElement {
 public:
     static PassRefPtrWillBeRawPtr<MediaControlCurrentTimeDisplayElement> create(MediaControls&);
 
 private:
     explicit MediaControlCurrentTimeDisplayElement(MediaControls&);
 };
 
-// ----------------------------
-
-class MediaControlTextTrackContainerElement final : public MediaControlDivElement {
-public:
-    static PassRefPtrWillBeRawPtr<MediaControlTextTrackContainerElement> create(MediaControls&);
-
-    void updateDisplay();
-    void updateSizes();
-
-private:
-    explicit MediaControlTextTrackContainerElement(MediaControls&);
-
-    virtual LayoutObject* createRenderer(const LayoutStyle&) override;
-
-    IntRect m_videoDisplaySize;
-    float m_fontSize;
-};
-
-
 } // namespace blink
 
 #endif // MediaControlElements_h