Add stevenjb@ to chromeos webui OWNERS

BUG=none

Review URL: https://codereview.chromium.org/888643004

Cr-Commit-Position: refs/heads/master@{#315082}

chrome/browser/resources/chromeos/OWNERS

@@ -3,6 +3,7 @@ nkostylev@chromium.org
 achuith@chromium.org
 zelidrag@chromium.org
 satorux@chromium.org
+stevenjb@chromium.org
 
 per-file drive_internals*=hashimoto@chromium.org
 per-file drive_internals*=kinaba@chromium.org

chrome/browser/ui/webui/chromeos/OWNERS

@@ -3,6 +3,7 @@ xiyuan@chromium.org
 nkostylev@chromium.org
 achuith@chromium.org
 satorux@chromium.org
+stevenjb@chromium.org
 
 per-file choose_mobile_network_ui.*=armansito@chromium.org
 per-file network*=stevenjb@chromium.org