Remove unused TextTrack virtual functions

Source/core/html/track/InbandTextTrack.cpp

Index: Source/core/html/track/InbandTextTrack.cpp
diff --git a/Source/core/html/track/InbandTextTrack.cpp b/Source/core/html/track/InbandTextTrack.cpp
index e98131fae710a451806f1a98af21ccf27fdc5016..7d248c1093db83c28a5605f95106d32eb88cdd7f 100644
--- a/Source/core/html/track/InbandTextTrack.cpp
+++ b/Source/core/html/track/InbandTextTrack.cpp
@@ -92,38 +92,6 @@ void InbandTextTrack::setMode(const AtomicString& mode)
         ASSERT_NOT_REACHED();
 }
 
-bool InbandTextTrack::isClosedCaptions() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isClosedCaptions();
-}
-
-bool InbandTextTrack::containsOnlyForcedSubtitles() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->containsOnlyForcedSubtitles();
-}
-
-bool InbandTextTrack::isMainProgramContent() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isMainProgramContent();
-}
-
-bool InbandTextTrack::isEasyToRead() const
-{
-    if (!m_private)
-        return false;
-
-    return m_private->isEasyToRead();
-}
-
 size_t InbandTextTrack::inbandTrackIndex()
 {
     ASSERT(m_private);