Use only registered users in vboot_reference OWNERS files.

AOSP project owners should be registered in Gerrit Code Review.

Bug: 33166666
Test: default build targets
Change-Id: If9113c0489345aae9dd4f3f809492eefc7daf943
diff --git a/scripts/OWNERS b/scripts/OWNERS
index 1df9a59..a64ccf7 100644
--- a/scripts/OWNERS
+++ b/scripts/OWNERS
@@ -1,3 +1,3 @@
-gauravsh@chromium.org
-rcui@chromium.org
-vapier@chromium.org
+gauravsh@google.com
+# rcui@google.com
+vapier@google.com