Remove the mode getter/setter for in-band text tracks

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 7d248c1093db83c28a5605f95106d32eb88cdd7f..0be9539e85e628fbac4ae2a79ba97a4f04e12d4d 100644
--- a/Source/core/html/track/InbandTextTrack.cpp
+++ b/Source/core/html/track/InbandTextTrack.cpp
@@ -75,23 +75,6 @@ InbandTextTrack::~InbandTextTrack()
     ASSERT(!m_private);
 }
 
-void InbandTextTrack::setMode(const AtomicString& mode)
-{
-    TextTrack::setMode(mode);
-
-    if (!m_private)
-        return;
-
-    if (mode == TextTrack::disabledKeyword())
-        m_private->setMode(InbandTextTrackPrivate::Disabled);
-    else if (mode == TextTrack::hiddenKeyword())
-        m_private->setMode(InbandTextTrackPrivate::Hidden);
-    else if (mode == TextTrack::showingKeyword())
-        m_private->setMode(InbandTextTrackPrivate::Showing);
-    else
-        ASSERT_NOT_REACHED();
-}
-
 size_t InbandTextTrack::inbandTrackIndex()
 {
     ASSERT(m_private);