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

Bug: 1113033
Change-Id: I4ee4da92c3c51ad639a17c96265ab34c1fd94944
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450742Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814250}