Remove hhb from OWNERS.

They haven't worked on Android for many years now...

Change-Id: I5b3f8b5cc3191ca95a2ba33b2a365085dcb84c67
diff --git a/OWNERS b/OWNERS
index 59a1608..0f0aaea 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,6 +1,5 @@
 krzysio@google.com
 allenhair@google.com
-hhb@google.com
 omakoto@google.com
 jiyong@google.com
 acleung@google.com