trackElementIndex   51 Source/core/html/track/LoadableTextTrack.h     size_t trackElementIndex();
trackElementIndex   65 Source/core/html/track/TextTrackList.cpp         return static_cast<LoadableTextTrack*>(textTrack)->trackElementIndex();
trackElementIndex  189 Source/core/html/track/TextTrackList.cpp         size_t index = static_cast<LoadableTextTrack*>(track.get())->trackElementIndex();