Renamed GetFocusNodeRect() to GetSelectionRegionRect().
Made code in GetPrimaryFrameForFocusNode() more generic and put it
in a method called GetPrimaryFrameForRangeEndpoint().
GetPrimaryFrameFor{Anchor,Focus}Node() now call GetPrimaryFrameForRangeEndpoint().
git-svn-id: svn://10.0.0.236/trunk@45769 18797224-902f-48f8-a5cc-f745e15eee43