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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}