Change PIEX owners to current Photos Backend members.
diff --git a/OWNERS b/OWNERS
index 589983a..8743fba 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,2 @@
-adaubert@google.com
-yujieqin@google.com
+chongsu@google.com
+nchusid@google.com