Remove TextTrackCue::notifyRegionWhenRemovingDisplayTree

Source/core/html/track/TextTrackCue.cpp

 /*
  * 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 130 matching lines @@
         return false;
 
     return EventTarget::dispatchEvent(event);
 }
 
 bool TextTrackCue::isActive()
 {
     return m_isActive && track() && track()->mode() != TextTrack::disabledKeyword();
 }
 
-void TextTrackCue::setIsActive(bool active)
-{
-    m_isActive = active;
-
-    // Remove the display tree as soon as the cue becomes inactive.
-    if (!active)
-        removeDisplayTree();
-}
-
 const AtomicString& TextTrackCue::interfaceName() const
 {
     return EventTargetNames::TextTrackCue;
 }
 
 DEFINE_TRACE(TextTrackCue)
 {
     visitor->trace(m_track);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink