GitLab

Generate DIR_METADATA files and remove metadata from OWNERS
files for //extensions.

R=mcnee@chromium.org, rdevlin.cronin@chromium.org

Bug: 1113033
Change-Id: Ia776ef0322aa315624d11ef7698b6cf049fe2cc9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2473437
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Kevin McNee <mcnee@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817721}