Add review alias note to c/b/ui/views/OWNERS

Adds reference to chromium-chrome-browser-ui-views-reviews@google.com as
a preference to individual reviewers.

Bug: None
Change-Id: I5bae9a9806315105ba389d651b78da303548cc06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522495
Commit-Queue: Peter Boström <pbos@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Collin Baker <collinbaker@chromium.org>
Auto-Submit: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824665}

chrome/browser/ui/views/OWNERS

-# Prefer ellyjones for Mac-specific changes.
+# Note: Unless you want a specific reviewer's expertise, please send CLs to
+# chromium-chrome-browser-ui-views-reviews@google.com rather than to specific
+# individuals. These CLs will be automatically reassigned to a reviewer within
+# about 5 minutes. This approach helps our team to load-balance incoming
+# reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 bsep@chromium.org
 collinbaker@chromium.org