Add DIR_METADATA files to some directories under //third_party

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

Bug: 1113033
Change-Id: I8d194fbc92282d01d7d1f7031d450587a743fd7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577615


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@{#834434}
GitOrigin-RevId: 15996b5d2322b634f4197447b10289bddc2b0b32