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Generate DIR_METADATA files and remove metadata from OWNERS
files for //base.

Bug: 1113033
Change-Id: Ic88522e24b0836394a67a13369d75840c125c82c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481290
Commit-Queue: Wez <wez@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Auto-Submit: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819848}