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

Bug: 1113033
Change-Id: Iff4a92ecbf28578e32833f9fe03a9d93343e50ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573119Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Cr-Commit-Position: refs/heads/master@{#834287}