[BackgroundSync] Only allow SyncManager.register to occur from main frame

third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html

Index: third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html b/third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html
index e2090b943753f1e4c25657725ad3118aa32c0d53..a763ab2e907c9e0d48bfc32a06624dc790123290 100644
--- a/third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html
+++ b/third_party/WebKit/LayoutTests/http/tests/background_sync/oneshot.html
@@ -14,9 +14,7 @@ promise_test(function(t) {
   var sync_manager;
   var sync_registration;
 
-  // This test verifies that one-shot syncs can be registered from service-
-  // worker-controlled documents. It creates a frame, after the service worker
-  // is active, in order to use its service worker registration.
+  // This test verifies that registration of one-shots fails from an iframe.
   return service_worker_unregister_and_register(t, url, scope)
     .then(function(sw_registration_page) {
         return wait_for_state(t, sw_registration_page.installing, 'activated');
@@ -38,10 +36,13 @@ promise_test(function(t) {
         return sync_manager.register('abcde');
       })
     .then(function() {
-        return service_worker_unregister(t, scope);
+        assert_unreached('iframes should not be able to register syncs');
+      }, function(e) {
+        assert_equals(e.name, 'AbortError');
+        assert_equals(e.message, 'Registration failed - not called from a main frame.');
+        service_worker_unregister(t, scope);
       });
-  }, 'Background Sync API should allow one-shot syncs to be registered from ' +
-     'the Document scope');
+  }, 'Background Sync should not allow registration from an iframe');
 
 promise_test(function(t) {
   var url = 'resources/empty_worker.js';
@@ -66,5 +67,5 @@ promise_test(function(t) {
         return service_worker_unregister(t, scope);
       })
   }, 'Background Sync API should allow one-shot syncs to be registered ' +
-     'with window clients not currently controlled by service worker');
+     'from an uncontrolled main-frame document');
 </script>