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Generate DIR_METADATA files and remove metatada from OWNERS files for //testing.

Bug: 1113033
Change-Id: Ic55848e4cd6b3ba004bb455c4f12fe490febbe3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450928Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814488}