Update OWNERS file

Remove Xooglers chh and nanzhang

Test: TreeHugger
Change-Id: Ib4a3ba6507841edab7dc57211d251c95b20ecead

OWNERS

diff --git a/OWNERS b/OWNERS
index 989d165..0047438 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,4 @@
 # Default owners are top 3 or more active developers of the past 1 or 2 years
 # or people with more than 10 commits last year.
 # Please update this list if you find better owner candidates.
-nanzhang@google.com
 dwillemsen@google.com
-chh@google.com