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Now that it is called directly from the single place,
lambda 'add_region' is not needed anymore.

Bug: 1126828
Change-Id: Ia3f21359fda9a06c05ce0307171340728f2e532d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641687
Commit-Queue: MINJU KIM <mkim@igalia.com>
Reviewed-by: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#845971}