Remove TextTrackCueBox

Source/core/html/track/vtt/VTTCue.h

Index: Source/core/html/track/vtt/VTTCue.h
diff --git a/Source/core/html/track/vtt/VTTCue.h b/Source/core/html/track/vtt/VTTCue.h
index c44a07488a0d03e85d3d65793c773cce0d9ec6d6..e006ae76b43881e4682c6ca60196ac341d9d8d54 100644
--- a/Source/core/html/track/vtt/VTTCue.h
+++ b/Source/core/html/track/vtt/VTTCue.h
@@ -39,9 +39,7 @@ class Document;
 class ExecutionContext;
 class VTTCue;
 
-// ----------------------------
-
-class VTTCueBox FINAL : public TextTrackCueBox {
+class VTTCueBox FINAL : public HTMLDivElement {
 public:
     static PassRefPtr<VTTCueBox> create(Document& document, VTTCue* cue)
     {
@@ -51,7 +49,7 @@ public:
     VTTCue* getCue() const { return m_cue; }
     void applyCSSProperties(const IntSize& videoSize);
 
-protected:
+private:
     VTTCueBox(Document&, VTTCue*);
 
     virtual RenderObject* createRenderer(RenderStyle*) OVERRIDE;
@@ -59,8 +57,6 @@ protected:
     VTTCue* m_cue;
 };
 
-// ----------------------------
-
 class VTTCue FINAL : public TextTrackCue, public ScriptWrappable {
 public:
     static PassRefPtr<VTTCue> create(Document& document, double startTime, double endTime, const String& text)
@@ -144,7 +140,7 @@ private:
     Document& document() const;
 
     PassRefPtr<VTTCueBox> displayTreeInternal();
-    PassRefPtr<TextTrackCueBox> getDisplayTree(const IntSize& videoSize);
+    PassRefPtr<VTTCueBox> getDisplayTree(const IntSize& videoSize);
 
     virtual void cueDidChange() OVERRIDE;