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Provide the keystone install script with a list of names that might
be the names of the updated Chrome app.

Update handling of brand codes by allowing side-by-side Chromes their
own brand codes.

Bug: 1061486
Change-Id: Ia1bcc1bf1326e7a35c332a61e9569ece32396662
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2233599
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776125}