Tidy up some parent-stub remains.
Tidy up some parent-stub remains.

* subversion/libsvn_wc/wc_db.c
  (navigate_to_parent): Remove.
  (svn_wc__db_op_copy): Remove comment that refers to parent stub.
  (svn_wc__db_scan_addition, svn_wc__db_scan_deletion): Replace
   navigate_to_parent with svn_wc__db_pdh_navigate_to_parent.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@996482 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion