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

Bug: 1113033
Change-Id: I2b1068f3b1709c27b3a9692f1f94430826cecac8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547923
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829316}