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

Bug: 1113033
Change-Id: Id810f3d68fdf7bc52eab805b02c2099e7c42ff14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577012
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835262}