Clean departed users from OWNERS files

We've had turnover in the media team; it's time to clean the departed
users and add the new users.

Bug: 203731695
Test: repo upload
Change-Id: I8f6249d94706333bbd2aa23e30445cf3657f743c
diff --git a/include/OWNERS b/include/OWNERS
index d6bd998..88de595 100644
--- a/include/OWNERS
+++ b/include/OWNERS
@@ -1,6 +1,5 @@
 elaurent@google.com
-gkasten@google.com
 hunga@google.com
 jtinker@google.com
 lajos@google.com
-marcone@google.com
+essick@google.com