Fetch: opaque redirect responses have a URL.

third_party/WebKit/LayoutTests/http/tests/fetch/script-tests/fetch.js

 if (self.importScripts) {
   importScripts('../resources/fetch-test-helpers.js');
 }
 
 promise_test(function(t) {
     return fetch('http://')
       .then(
         t.unreached_func('fetch of invalid URL must fail'),
         function() {});
   }, 'Fetch invalid URL');
@@ skipping 153 matching lines @@
 
     var request = new Request(redirect_original_url, {redirect: 'manual'});
     assert_equals(request.url, redirect_original_url,
       'Request\'s url is the original URL');
     assert_equals(request.redirect, 'manual');
 
     return fetch(request)
       .then(function(response) {
           assert_equals(response.status, 0);
           assert_equals(response.type, 'opaqueredirect');
-          assert_equals(response.url, '');
+          assert_equals(response.url, request.url);
         });
   }, 'Manual redirect fetch returns opaque redirect response');
 
 promise_test(function(t) {
     var redirect_target_url =
       OTHER_ORIGIN + '/fetch/resources/fetch-status.php?status=200';
     var redirect_original_url =
       OTHER_ORIGIN + '/serviceworker/resources/redirect.php?Redirect=' +
       redirect_target_url;
 
@@ skipping 177 matching lines @@
     assert_true(req.bodyUsed);
 }, 'Calling fetch() disturbs body if not null');
 
 test(t => {
     var req = new Request('/', {method: 'POST'});
     fetch(req);
     assert_false(req.bodyUsed);
 }, 'Calling fetch() doesn\'t disturb body if null');
 
 done();