[owners] Remove zachoverflow@google.com from OWNERS

This suggested change is automatically generated based on group
memberships and affiliations.

Please approve this change and vote the highest CR. This will keep the OWNERs
file tidy.  We ask that you do not ignore this change and approve it
unless you know a reason the OWNER should remain.  It can always be
reverted if needed.

If this change is in error, vote the lowest CR value (i.e. reject the CL)
and the bot will abandon it.

See the owner's recent review activity for context:
https://android-review.googlesource.com/q/zachoverflow@google.com

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Change-Id: I2ab3dade70e78a7403b1e98fa35bae24fefc69fd
diff --git a/OWNERS b/OWNERS
index 53e5f73..98ec162 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,3 @@
-zachoverflow@google.com
 elaurent@google.com
 jpawlowski@google.com
 malchev@google.com