Make sdefresne OWNER of //services/identity

Sylvain is ramping up to full co-ownership of the Identity Service. Add
him as an OWNER now to allow him to make straightforward changes when
the two existing OWNERS are both OOO. He will of course defer to the
existing OWNERS for complex changes (either making or reviewing) while
ramping up.

Change-Id: I287b712c402c04dcbf384e3d78b6842f90b3fafc
Reviewed-on: https://chromium-review.googlesource.com/1061459Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559056}

services/identity/OWNERS

@@ -2,6 +2,7 @@
 
 blundell@chromium.org
 msarda@chromium.org
+sdefresne@chromium.org
 
 per-file manifest.json=set noparent
 per-file manifest.json=file://ipc/SECURITY_OWNERS