ServiceWorker cleanup: remove wait_for_activated(); just use wait_for_state()

LayoutTests/http/tests/serviceworker/appcache-ordering-main.html

Index: LayoutTests/http/tests/serviceworker/appcache-ordering-main.html
diff --git a/LayoutTests/http/tests/serviceworker/appcache-ordering-main.html b/LayoutTests/http/tests/serviceworker/appcache-ordering-main.html
index bd0ca800ad801c5be6d4cff0fecc1cd3c52a46bb..5a39c264a00d4c65ef91f22416e844314e1ed909 100644
--- a/LayoutTests/http/tests/serviceworker/appcache-ordering-main.html
+++ b/LayoutTests/http/tests/serviceworker/appcache-ordering-main.html
@@ -70,7 +70,7 @@ async_test(function(t) {
               t, SERVICE_WORKER_SCRIPT, SERVICE_WORKER_SCOPE);
         })
       .then(function(r) {  
-          return wait_for_activated(t, r);
+          return wait_for_state(t, r.installing, 'activated');
         })
       .then(function() {  
           return is_appcached();