[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: I6ca521e0ee5f5ee41187097430f58b6eda1f603c
diff --git a/OWNERS b/OWNERS
index 8ac45a3..d220c22 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,5 @@
 # Default code reviewers picked from top 3 or more developers.
 # Please update this list if you find better candidates.
 # sriniv@google.com # not found in AOSP Gerrit yet
-ajchen@google.com
 arnaudberry@google.com
 robertoalexis@google.com