Revert "Add OWNERS."
This reverts commit 5800997969.
It doesn't make sense to have a giant OWNERS file that applies to all
of the directories in this repository.
Bug: http://b/70201085
Change-Id: I8ad03e6ae6f0a58bdb7499e359eaf61e9869cb39
Exempted-From-Owner-Approval: this OWNERS file never should have existed
Test: none
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