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Generate DIR_METADATA files and remove metatada from OWNERS files for //ash

Bug: 1113033
Change-Id: Ife8822c2571bc4e629d2ba68c050a9005d67703d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340712Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Norman Rosas <normando@google.com>
Cr-Commit-Position: refs/heads/master@{#799220}