Remove former members from OWNERS.

Test: N/A
Change-Id: Id9a8a8be328e47c125c4bd55485879a6c6c72762
diff --git a/OWNERS b/OWNERS
index 9d9977b..5e4e8cd 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,7 +1,5 @@
 butlermichael@google.com
 dgross@google.com
-ijsung@google.com
 jeanluc@google.com
 miaowang@google.com
 srhines@google.com
-yangni@google.com