Add myself to OWNERS, remove xoolger addresses

Change-Id: I4bcffb767c857488e5b4e5693643bb7ffdc69b62
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/18980
Commit-Queue: Andrew Grieve <agrieve@google.com>
Reviewed-by: Takuto Ikuta <tikuta@google.com>

OWNERS

diff --git a/OWNERS b/OWNERS
index 4b531ff..e33cf3c 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,7 +1,7 @@
+agrieve@google.com
 brettw@chromium.org
-brettw@google.com
 digit@google.com
-dpranke@google.com
+dpranke@chromium.org
 phosek@google.com
 sdefresne@chromium.org
 tikuta@google.com