ServiceWorker: throw when close() or terminate() called

LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js

 importScripts('interfaces.js');
 importScripts('worker-test-harness.js');
 
 test(function() {
     var EVENT_HANDLER = 'object';
 
     verifyInterface('ServiceWorkerGlobalScope',
                     self,
                     {
                         scope: 'string',
                         clients: 'object',
+                        close: 'function',
 
                         onactivate: EVENT_HANDLER,
                         onfetch: EVENT_HANDLER,
                         oninstall: EVENT_HANDLER,
                         onmessage: EVENT_HANDLER
                     });
 
     verifyInterface('ServiceWorkerClients',
                     self.clients,
                     {
                         getServiced: 'function'
                     });
 
     verifyInterface('ServiceWorkerClient');
     // FIXME: Get an instance and test it, or ensure property exists on prototype.
 
 }, 'Interfaces and attributes in ServiceWorkerGlobalScope');