Add xiyuan to c/b/sessions/OWNERS for chromeos files

BUG=none
TEST=none

Review-Url: https://codereview.chromium.org/2628923003
Cr-Commit-Position: refs/heads/master@{#443322}

chrome/browser/sessions/OWNERS

@@ -5,3 +5,5 @@ per-file restore_on_startup_policy_handler*=atwilson@chromium.org
 per-file session_restore_android*=dfalcantara@chromium.org
 per-file session_restore_android*=yfriedman@chromium.org
 per-file session_restore_android*=felipeg@chromium.org
+
+per-file session_restore*chromeos*=xiyuan@chromium.org