ServiceWorker: Make APIs that return ServiceWorkerRegistration coin a new JS object (3/3)

LayoutTests/http/tests/serviceworker/unregister-then-register.html

Index: LayoutTests/http/tests/serviceworker/unregister-then-register.html
diff --git a/LayoutTests/http/tests/serviceworker/unregister-then-register.html b/LayoutTests/http/tests/serviceworker/unregister-then-register.html
index 976795fb58ac97bc869169ccebdf38140d3e6897..9fd7133f755f38721c20ba6b2983bbc5839ba755 100644
--- a/LayoutTests/http/tests/serviceworker/unregister-then-register.html
+++ b/LayoutTests/http/tests/serviceworker/unregister-then-register.html
@@ -48,8 +48,9 @@ async_test(function(t) {
           return navigator.serviceWorker.register(worker_url, { scope: scope });
         })
       .then(function(new_registration) {
-          assert_equals(registration, new_registration,
-                        'register should resolve to the same value');
+          assert_registration_equals(
+            registration, new_registration,
+            'register should resolve to the same registration');
           service_worker_unregister_and_done(t, scope);
         })
       .catch(unreached_rejection(t));