This fixes the issue where presubmit_canned_checks issues a warning if
optional arguments in CheckAuthorizedAuthor are not used at all.

This relands commit b09f2bb2 with some
additional changes.

R=apolito@google.com

Bug: 1098560
Change-Id: If323d90ab7d6bcca68ed89142ea67edc4be057d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2373216Reviewed-by: Anthony Polito <apolito@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>