On the verify-at-commit branch, revert r1462054.  This removes the approach
which 'svnadmin verify -t' makes obsolete.

* subversion/libsvn_fs_fs/fs_fs.c
  (verify_as_revision_before_current_plus_plus): Remove reference to now-removed
    svn_fs_t member.

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/verify-at-commit@1462401 13f79535-47bb-0310-9956-ffa450edef68