[owners] Remove ajchen@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/ajchen@google.com

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Change-Id: Iace4850e624cd7033cb160e9aed2aa145e9b4e0c
diff --git a/OWNERS b/OWNERS
index c6a8f5a..b36dee8 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,4 +1,3 @@
 # Default code reviewers picked from top 3 or more developers.
 # Please update this list if you find better candidates.
 nicksauer@google.com
-ajchen@google.com