Permissions: use newly supported required attribute on Dictionary properties.

LayoutTests/http/tests/permissions/resources/test-query.js

 if (self.importScripts) {
     importScripts('helpers.js');
 
     if (get_current_scope() == 'ServiceWorker')
         importScripts('../../serviceworker/resources/worker-testharness.js');
     else
         importScripts('../../resources/testharness.js');
 }
 
 async_test(function(test) {
+    // Querying a random permission name should fail.
+    navigator.permissions.query({name:'foobar'}).then(function(result) {
+        assert_unreached('querying a random permission should fail');
+    }, function(error) {
+        assert_equals(error.name, 'TypeError');
+
+        // Querying a permission without a name should fail.
+        return navigator.permissions.query({});
+    }).then(function(result) {
+        assert_unreached('querying a permission without a name should fail');
+    }, function(error) {
+        assert_equals(error.name, 'TypeError');
+        test.done();
+    });
+}, 'Test PermissionDescription WebIDL rules in ' + get_current_scope() + ' scope.');
+
+async_test(function(test) {
     navigator.permissions.query({name:'geolocation'}).then(function(result) {
         // TODO(mlamouri): test values when some instrumentation are available.
         assert_true(result instanceof PermissionStatus);
         test.done();
     }).catch(function() {
         assert_unreached('querying geolocation permission should not fail.')
     });
 }, 'Test geolocation permission in ' + get_current_scope() + ' scope.');
 
 async_test(function(test) {
@@ skipping 48 matching lines @@
     }).then(function(result) {
         // TODO(mlamouri): test values when some instrumentation are available.
         assert_true(result instanceof PermissionStatus);
         test.done();
     }).catch(function() {
         assert_unreached('querying push permission should not fail.')
     });
 }, 'Test push permission in ' + get_current_scope() + ' scope.');
 
 done();