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

Bug: 1113033
Change-Id: Ib54a8a6a3411975497c110037812f088d0b14330
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545086
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828468}