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

Bug: 1113033
Change-Id: Ifef310c71f90479e7c0ab615e4c9066ad7ebeb9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545242
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828316}