Add joenotcharles@ as an owner of c/b/sb/chrome_cleaner

Bug: 
Change-Id: I76e57841c0cb570aca8953137f9543642a61fc4e
Reviewed-on: https://chromium-review.googlesource.com/748780Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513210}

chrome/browser/safe_browsing/chrome_cleaner/OWNERS

 csharp@chromium.org
+joenotcharles@chromium.org
 robertshield@chromium.org
 
 # COMPONENT: UI>Browser>Preferences>Protector