Implement redirect() API for Fetch Response

LayoutTests/http/tests/fetch/script-tests/headers-guard.js

Index: LayoutTests/http/tests/fetch/script-tests/headers-guard.js
diff --git a/LayoutTests/http/tests/fetch/script-tests/headers-guard.js b/LayoutTests/http/tests/fetch/script-tests/headers-guard.js
index 00ce90bed40ecc69756ccfb6ec9a639c55736d9b..e8cb30dabd70378e5939e6e0ffe38fb02b9bc1ce 100644
--- a/LayoutTests/http/tests/fetch/script-tests/headers-guard.js
+++ b/LayoutTests/http/tests/fetch/script-tests/headers-guard.js
@@ -368,7 +368,9 @@ promise_test(function(t) {
         [res.headers,
          res.clone().headers,
          Response.error().headers,
-         Response.error().clone().headers].forEach(function(headers) {
+         Response.error().clone().headers,
+         Response.redirect().headers,

[yhirano, 2015/04/20 04:55:30]

Response.redirect throws when |url| is not provided, right?

[shiva.jm, 2015/04/27 10:50:54]

Done. added valid URL to correct tests.

+         Response.redirect().clone().headers].forEach(function(headers) {
             testInvalidNamesAndValues(headers);
 
             // Test that TypeError is thrown for all header names.