Rename ContextDestructionObserver to ContextLifecycleObserver

Source/core/html/track/TextTrackRegion.h

 /*
  * Copyright (C) 2013 Google 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TextTrackRegion_h
 #define TextTrackRegion_h
 
 #if ENABLE(WEBVTT_REGIONS)
 
-#include "core/dom/ContextDestructionObserver.h"
+#include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/html/track/TextTrack.h"
 #include "core/platform/graphics/FloatPoint.h"
 #include <wtf/PassOwnPtr.h>
 #include <wtf/RefCounted.h>
 
 namespace WebCore {
 
 class HTMLDivElement;
 class TextTrackCueBox;
 
-class TextTrackRegion : public RefCounted<TextTrackRegion>, public ContextDestructionObserver {
+class TextTrackRegion : public RefCounted<TextTrackRegion>, public ContextLifecycleObserver {
 public:
     static PassRefPtr<TextTrackRegion> create(ScriptExecutionContext* context)
     {
         return adoptRef(new TextTrackRegion(context));
     }
 
     virtual ~TextTrackRegion();
 
     TextTrack* track() const { return m_track; }
     void setTrack(TextTrack*);
@@ skipping 96 matching lines @@
     // soon as the animation for rolling out one line has finished, but
     // currently it is used also for non-scrolling regions to use a single
     // code path.
     Timer<TextTrackRegion> m_scrollTimer;
 };
 
 } // namespace WebCore
 
 #endif
 #endif