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This is a follow up from https://crrev.com/c/2055597
to add webui to the owners for the resources file.

Change-Id: I63ab01298933c1c81a3c35d462571563066d28e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062929Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742230}