Don't show Restrictions item if it has been disabled for the user.

Also don't show actual Restrictions content if the fragment was launched
through a different entry point.

Change-Id: I70cb76ca6f68a382e68219053e6f69e7f1fa0150

src/com/android/settings/Settings.java

@@ -488,7 +488,8 @@ public class Settings extends PreferenceActivity
                     target.remove(i);
                 }
             } else if (id == R.id.restriction_settings) {
-                if (um.isLinkedUser()) {
+                if (um.isLinkedUser()
+                        || um.hasUserRestriction(UserManager.DISALLOW_APP_RESTRICTIONS)) {
                     target.remove(i);
                 }
             }