willRemoveVTTCueBox  765 Source/core/html/track/vtt/VTTCue.cpp             region->willRemoveVTTCueBox(m_displayTree.get());
willRemoveVTTCueBox   95 Source/core/html/track/vtt/VTTRegion.h     void willRemoveVTTCueBox(VTTCueBox*);