[1/N] Add DIR_METADATA files to directories under //third_party/ Generate DIR_METADATA files and remove metadata from OWNERS files for directories under //third_party/. [email protected] Bug: 1113033 Change-Id: If7ee35e80c00f427198e6f30bc42e7e921fee708 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572725 Auto-Submit: Gavin Mak <[email protected]> Commit-Queue: Yaron Friedman <[email protected]> Reviewed-by: Yaron Friedman <[email protected]> Cr-Commit-Position: refs/heads/master@{#833720} GitOrigin-RevId: db0d0146b4e7a28fe04bd96b0c4cb1e814f7aa65