[Background Sync] Remove out-of-date layout test

LayoutTests/http/tests/background_sync/oneshot.html

Index: LayoutTests/http/tests/background_sync/oneshot.html
diff --git a/LayoutTests/http/tests/background_sync/oneshot.html b/LayoutTests/http/tests/background_sync/oneshot.html
index 4f6211c597caec292158e333382c94ec0b68721a..fd8f698ab06d77ce7ec838519b1dcd1a44ee2ed2 100644
--- a/LayoutTests/http/tests/background_sync/oneshot.html
+++ b/LayoutTests/http/tests/background_sync/oneshot.html
@@ -51,32 +51,10 @@ promise_test(function(t) {
   }, 'Background Sync API should allow one-shot syncs to be registered from ' +
      'the Document scope');
 
-promise_test(function(t) {
-  var url = 'resources/empty_worker.js';
-  var scope = 'resources/scope/background_sync/oneshot-uncontrolled.html';
-  var sync_manager;
-  var sync_registration;
-
-  // One-shot syncs can only be registered from a controlled document. This
-  // test creates a frame, after the service worker is active, in order to use
-  // its service worker registration.
-  return service_worker_unregister_and_register(t, url, scope)
-    .then(function(sw_registration) {
-        sync_manager = sw_registration.sync;
-        return wait_for_state(t, sw_registration.installing, 'activated');
-      })
-    .then(function() { return clear_registered_syncs(sync_manager); })
-    .then(function() { return sync_manager.getRegistrations(); })
-    .then(function(registrations) {
-        assert_equals(registrations.length, 0, 'One-shot syncs should be ' +
-                      'cleared at the start of the test.');
-        return assert_promise_rejects(
-            sync_manager.register({tag: 'should fail'}),
-            'InvalidAccessError',
-            'Should throw with message "Cannot register a sync event without ' +
-            'a window client."');
-      })
-    .then(function() { return service_worker_unregister(t, scope); })
-  }, 'Background Sync API should not allow one-shot syncs to be registered ' +
-     'without window clients controlled by service worker');
+// The test which verified that uncontrolled window clients could not register
+// sync events is out-of-date, and so has been removed. Uncontrolled window
+// clients should be allowed to register sync events, as long as they have a
+// registered service worker.
+// TODO(iclelland): Add a test which verifies the correct behaviour, as per
+// crbug/518884
 </script>