FetchEvent should not forcibly reject an unresolved Promise when destructed

LayoutTests/http/tests/serviceworker/resources/fetch-event-test-worker.js

 function handleString(event) {
     event.respondWith(new Response('Test string'));
 }
 
 function handleBlob(event) {
     event.respondWith(new Response(new Blob(['Test blob'])));
 }
 
 function handleReferrer(event) {
     event.respondWith(new Response(new Blob(['Referrer: ' + event.request.referrer])));
 }
 
 function handleNullBody(event) {
     event.respondWith(new Response(null));
 }
 
 function handleReject(event) {
     event.respondWith(new Promise(function(resolve, reject) {
         reject('rejected!');
     }));
 }
 
-function handleUnresolved(event) {
-    event.respondWith(new Promise(function(resolve, reject) { }));
-}
-
 function handleFetch(event) {
     event.respondWith(fetch('other.html'));
 }
 
 self.addEventListener('fetch', function(event) {
     var url = event.request.url;
     var handlers = [
         { pattern: '?string', fn: handleString },
         { pattern: '?blob', fn: handleBlob },
         { pattern: '?referrer', fn: handleReferrer },
         { pattern: '?ignore', fn: function() {} },
         { pattern: '?null', fn: handleNullBody },
         { pattern: '?reject', fn: handleReject },
-        { pattern: '?unresolved', fn: handleUnresolved },
         { pattern: '?fetch', fn: handleFetch }
     ];
 
     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(new Response(new Blob(['Service Worker got an unexpected request: ' + url])));
 });