Clean up OWNERS file

Change-Id: Ifa604fdc8cd9ed51d8aaa38468ff80a7fac4c603
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/84161
Auto-Submit: Ryan Harrison <rharrison@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/OWNERS b/OWNERS
index 4ebbd00..18239af 100644
--- a/OWNERS
+++ b/OWNERS
@@ -5,5 +5,3 @@
 dneto@google.com
 jrprice@google.com
 rharrison@chromium.org
-rharrison@google.com
-sarahmashay@google.com