GitLab

I noticed that we leave a crufty debug.log file in the directory
when our MSI is removed.  I added a custom action to clean it
up so we don't leave cruft on the system during upgrades or
uninstalls.

Change-Id: Ibbb13dcdcbc60dc95c3db4996d1243637354afe5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033625Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737478}