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

Source/core/html/track/TextTrack.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012, 2013 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 67 matching lines @@
     void setLabel(const AtomicString& label) { m_label = label; }
 
     AtomicString language() const { return m_language; }
     void setLanguage(const AtomicString& language) { m_language = language; }
 
     static const AtomicString& disabledKeyword();
     static const AtomicString& hiddenKeyword();
     static const AtomicString& showingKeyword();
 
     AtomicString mode() const { return m_mode; }
-    virtual void setMode(const AtomicString&);
+    void setMode(const AtomicString&);
 
     enum ReadinessState { NotLoaded = 0, Loading = 1, Loaded = 2, FailedToLoad = 3 };
     ReadinessState readinessState() const { return m_readinessState; }
     void setReadinessState(ReadinessState state) { m_readinessState = state; }
 
     TextTrackCueList* cues();
     TextTrackCueList* activeCues() const;
 
     void clearClient() { m_client = 0; }
     TextTrackClient* client() { return m_client; }
@@ skipping 57 matching lines @@
     TextTrackType m_trackType;
     ReadinessState m_readinessState;
     int m_trackIndex;
     int m_renderedTrackIndex;
     bool m_hasBeenConfigured;
 };
 
 } // namespace WebCore
 
 #endif