Add DIR_METADATA files to directories under //third_party

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

Bug: 1113033
Change-Id: I132498741f951890f4137330908c1722f1e84163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492640
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819929}
GitOrigin-RevId: 7c1104a1727e87b9b09cf2bd9d4577d8fbd1413c
2 files changed