Add default code reviewers into OWNERS

Bug: 33166666
Test: gerrit uploader
Change-Id: I919050944cb81f5c09e90c04820bef76ace96637
diff --git a/OWNERS b/OWNERS
index eb615cc..3d357dd 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.
 ghartman@google.com
-haining@google.com