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

Bug: 1113033
Change-Id: Ia223073dc571c11b1bc55eeaba7e8a9d738de16d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451392Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814302}