Update OWNERS.

Test: N/A
Change-Id: Ia76ae692c46add32eaa812b47e543c031c1a551d
diff --git a/OWNERS b/OWNERS
index ef9a19a..ab036c1 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,3 +1,3 @@
 deymo@google.com
 senj@google.com
-tbao@google.com
+xunchang@google.com