Remove add_codereview_message.py

Seems unlikely to have been used recently, since we haven't been on
rietveld code review in some time.

Also, for some reason removing this file allows checking more files for
include order?

Change-Id: I940baf7b4de393de999385dc33d20b4139002e0a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/842483
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Ben Wagner <bungeman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
5 files changed