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Add Generate DIR_METADATA files and remove metatada from OWNERS files for //ppapi.

R=bbudge@chromium.org

Bug: 1113033
Change-Id: I6b9b22d4d041d2ceb54a1467922087a6a35a3029
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454630
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814919}