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

Bug: 1113033
Change-Id: I60be4e5525068acd60f21ece7d599a667a9fc56d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572880
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@{#834060}