Implement request's redirect mode and RequestRedirect for Fetch

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

Index: LayoutTests/http/tests/fetch/script-tests/fetch.js
diff --git a/LayoutTests/http/tests/fetch/script-tests/fetch.js b/LayoutTests/http/tests/fetch/script-tests/fetch.js
index b73e7e4efa9698b823d3560cb62b96a56545dc43..f8a1616470edd9104c9601cd24c1b5238eb34a2d 100644
--- a/LayoutTests/http/tests/fetch/script-tests/fetch.js
+++ b/LayoutTests/http/tests/fetch/script-tests/fetch.js
@@ -56,6 +56,7 @@ sequential_promise_test(function(t) {
     assert_equals(request.url,
       BASE_ORIGIN + '/serviceworker/resources/fetch-status.php?status=200');
     assert_equals(request.context, '');
+    assert_equals(request.redirect, 'follow');
 
     return fetch(request)
       .then(function(response) {
@@ -68,6 +69,7 @@ sequential_promise_test(function(t) {
             BASE_ORIGIN +
             '/serviceworker/resources/fetch-status.php?status=200');
           assert_equals(request.context, '');
+          assert_equals(request.redirect, 'follow');
         });
   }, 'Request/response url attribute getter with fragment');
 
@@ -82,6 +84,7 @@ sequential_promise_test(function(t) {
     assert_equals(request.url, redirect_original_url,
       'Request\'s url is the original URL');
     assert_equals(request.context, '');
+    assert_equals(request.redirect, 'follow');
 
     return fetch(request)
       .then(function(response) {
@@ -92,6 +95,7 @@ sequential_promise_test(function(t) {
           assert_equals(request.url, redirect_original_url,
             'Request\'s url remains the original URL');
           assert_equals(request.context, '');
+          assert_equals(request.redirect, 'follow');
         });
   }, 'Request/response url attribute getter with redirect');
 
@@ -111,6 +115,7 @@ sequential_promise_test(function(t) {
                     body: new Blob(['Test Blob'], {type: 'test/type'})
                   });
     assert_equals(request.context, '');
+    assert_equals(request.redirect, 'follow');
     return fetch(request)
       .then(function(response) { return response.text(); })
       .then(evalJsonp)
@@ -118,6 +123,7 @@ sequential_promise_test(function(t) {
           assert_equals(result.method, 'POST');
           assert_equals(result.body, 'Test Blob');
           assert_equals(request.context, '');
+          assert_equals(request.redirect, 'follow');
         });
   }, 'Fetch with Blob body test');