Minor cleanups to chrome_cleaner/components and chrome_cleaner/cleaner

Remove an unused constant that was moved to a test/ header
Fix copyright header format in cleaner dir
Fix comma in comments in constants dir

R=csharp@chromium.org

Bug: 830892
Change-Id: I8e91c4e320ceb3f8758d7182853dd46874968f6e
Reviewed-on: https://chromium-review.googlesource.com/c/1336048
Commit-Queue: Joe Mason <joenotcharles@google.com>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608388}
5 files changed