Revert "Add OWNERS block to facilitate in migration"

This reverts commit 9e569671a3752c4edd95367f483355ad31fac8d4.

Reason for revert: atoms and associated protos have been migrated.  Removing migration block.

Change-Id: Ia1e4a73001ebc9509b8550c7957135172ce8938d
BUG: 167962588
Test: TH
2 files changed