Upstream service worker navigation tests to WPT

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/navigation-redirect-body-worker.js

-self.addEventListener('fetch', function(event) {
-    event.respondWith(
-        fetch(event.request)
-          .then(
-              function(response) {
-                return response;
-              },
-              function(error) {
-                return new Response('Error:' + error);
-              }));
-  });