Remove TextTrackCueBox

Source/core/html/track/TextTrackCue.cpp

Index: Source/core/html/track/TextTrackCue.cpp
diff --git a/Source/core/html/track/TextTrackCue.cpp b/Source/core/html/track/TextTrackCue.cpp
index 45358f1e1a240c76ab4190f1ee04ff8273600415..50a3205296cbcf68ad3b6aecb4101237c07ee8b4 100644
--- a/Source/core/html/track/TextTrackCue.cpp
+++ b/Source/core/html/track/TextTrackCue.cpp
@@ -42,15 +42,6 @@ namespace WebCore {
 
 static const int invalidCueIndex = -1;
 
-// ----------------------------
-
-TextTrackCueBox::TextTrackCueBox(Document& document)
-    : HTMLDivElement(document)
-{
-}
-
-// ----------------------------
-
 bool TextTrackCue::isInfiniteOrNonNumber(double value, const char* method, ExceptionState& exceptionState)
 {
     if (!std::isfinite(value)) {