Hide call to removeDisplayTree in CueTimeline

Source/core/html/track/CueTimeline.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CueTimeline_h
 #define CueTimeline_h
 
 #include "core/html/track/TextTrackCue.h"
 #include "core/html/track/vtt/VTTCue.h"
 #include "platform/PODIntervalTree.h"
@@ skipping 13 matching lines @@
 // with TextTracks. Owned by a HTMLMediaElement.
 class CueTimeline : public NoBaseWillBeGarbageCollectedFinalized<CueTimeline> {
 public:
     CueTimeline(HTMLMediaElement&);
 
     void addCues(TextTrack*, const TextTrackCueList*);
     void addCue(TextTrack*, PassRefPtrWillBeRawPtr<TextTrackCue>);
     void removeCues(TextTrack*, const TextTrackCueList*);
     void removeCue(TextTrack*, PassRefPtrWillBeRawPtr<TextTrackCue>);
 
+    void hideCues(TextTrack*, const TextTrackCueList*);
+
     void updateActiveCues(double);
 
     bool ignoreUpdateRequests() const { return m_ignoreUpdate > 0; }
     void beginIgnoringUpdateRequests();
     void endIgnoringUpdateRequests();
 
     CueList currentlyActiveCues() const { return m_currentlyActiveCues; }
 
     DECLARE_TRACE();
 
@@ skipping 46 matching lines @@
     static String string(TextTrackCue* const& cue)
     {
         return cue->toString();
     }
 };
 #endif
 
 } // namespace blink
 
 #endif // CueTimeline_h