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Generate DIR_METADATA files and remove metadata from OWNERS
files for directories under //chrome/browser/ui.

Bug: 1113033
Change-Id: I7b66fc969130543f13445bd86c7a443c0de6b7e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544872
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Michael Wasserman <msw@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828458}