Remove some parameters that have long been unused.
Remove some parameters that have long been unused.

* subversion/libsvn_client/merge.c
  (get_mergeinfo_paths): Remove 'merge_src_canon_path', 'url1', 'url2',
  'revision1', 'revision2', 'ra_session'.
  (do_directory_merge): Adjust caller.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1212286 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion