Update OWNERS list.

Add dpranke@ back into OWNERS list.
Add digit@.
Add brettw@google.com.
Remove scottmg@.

Change-Id: I4bfb4417a33597c52cd6e40bf038a8af7966fa86
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/16220
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: David Turner <digit@google.com>
Reviewed-by: Petr Hosek <phosek@google.com>

OWNERS

diff --git a/OWNERS b/OWNERS
index 3b888ff..4b531ff 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1,7 @@
 brettw@chromium.org
+brettw@google.com
+digit@google.com
+dpranke@google.com
 phosek@google.com
-scottmg@chromium.org
 sdefresne@chromium.org
 tikuta@google.com