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

Bug: 1113033
Change-Id: Ia6928e6b0683ed63c4bc747ad6143488076e4a59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572727
Commit-Queue: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Auto-Submit: Gavin Mak <gavinmak@google.com>
Cr-Commit-Position: refs/heads/master@{#835323}