Add "# COMPONENT" to xdg-utils OWNERS file

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: Ie0f668dc6d8d1eccdce4c9a4593487e52a537df6
diff --git a/OWNERS b/OWNERS
index 86725df..0958234 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,2 +1,4 @@
 mdm@chromium.org
 thestig@chromium.org
+
+# COMPONENT: Internals>PlatformIntegration