Make required dictionary members non-nullable again

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/foreign-fetch-worker.js

 self.addEventListener('install', function(event) {
     var params = JSON.parse(decodeURIComponent(location.search.substring(1)));
     if (!('scopes' in params)) {
       if ('relscopes' in params) {
         params.scopes = params.relscopes.map(s => registration.scope + s);
       } else {
         params.scopes = [registration.scope];
       }
     }
     if (!('origins' in params))
       params.origins = ['*'];
     event.registerForeignFetch(params);
   });
 
 function handle_basic(event) {
   event.respondWith({response: new Response('Foreign Fetch'), origin: event.origin});
 }
 
+function handle_null(event) {
+  event.respondWith({response: null });
+}
+
 function handle_onmessage(event) {
   event.respondWith({origin: event.origin, response:
     new Response('<script>window.onmessage = e => e.ports[0].postMessage("failed");</script>',
                  {headers: {'Content-Type': 'text/html'}})});
 }
 
 function handle_fallback(event) {
   // Do nothing.
 }
 
@@ skipping 13 matching lines @@
 
 function handle_script(event) {
   event.respondWith({origin: event.origin, response:
     new Response('self.DidLoad("Foreign Fetch");')});
 }
 
 self.addEventListener('foreignfetch', function(event) {
     var url = event.request.url;
     var handlers = [
       { pattern: '?basic', fn: handle_basic },
+      { pattern: '?null', fn: handle_null },
       { pattern: '?fallback', fn: handle_fallback },
       { pattern: '?fetch', fn: handle_fetch },
       { pattern: '?onmessage', fn: handle_onmessage },
       { pattern: '?meta', fn: handle_meta },
       { pattern: '?script', fn: handle_script }
     ];
 
     var handler = null;
     for (var i = 0; i < handlers.length; ++i) {
       if (url.indexOf(handlers[i].pattern) != -1) {
         handler = handlers[i];
         break;
       }
     }
 
     if (handler) {
       handler.fn(event);
     } else {
       event.respondWith({origin: event.origin,
                          response: new Response('unexpected request')});
     }
   });