Only detect outdated builds on Google Chrome.

Prior to https://crrev.com/643864, they weren't detected for Chromium on
account of the way google_brand worked. That CL changed behavior and
accidentally started showing the outdated build bubble for Linux
Chromium users.

BUG=1010592

Change-Id: I069ac36166e2ae720d58b1b9aa85605792be8684
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841635
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703131}
1 file changed