didChangeVisibleSelection  206 Source/core/editing/FrameSelection.h     virtual void didChangeVisibleSelection() OVERRIDE;
didChangeVisibleSelection  760 Source/core/editing/VisibleSelection.cpp         m_changeObserver->didChangeVisibleSelection();
didChangeVisibleSelection  124 Source/core/editing/VisibleSelection.h         virtual void didChangeVisibleSelection() = 0;