Add iannucci to depot_tools OWNERS

He has a lot of experience in this directory and we could
use the additional reviewer.

Also remove nsylvain, who is inactive.

R=maruel@chromium.org

Review URL: https://chromiumcodereview.appspot.com/13918011

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@196130 0039d316-1c4b-4281-b951-d872f2087c98

OWNERS

@@ -2,10 +2,9 @@ set noparent
 bradnelson@google.com
 cmp@chromium.org
 dpranke@chromium.org
+iannucci@chromium.org
 maruel@chromium.org
 maruel@google.com
-nsylvain@chromium.org
-nsylvain@google.com
 petermayo@chromium.org
 rogerta@chromium.org
 szager@chromium.org