Allow redirects for requests that require preflight.

third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html

Index: third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html b/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html
index 83fc3b650b9786d4ccaff354a084a4c6e90f5f7b..738f44bf5781ae2d6e8f23039f8f257313164199 100644
--- a/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html
+++ b/third_party/WebKit/LayoutTests/http/tests/xmlhttprequest/access-control-and-redirects-async.html
@@ -49,10 +49,8 @@ var tests = [
 
 // Receives a redirect response with CORS headers. The redirect response passes the access check and the resource response
 // passes the access check.
-// FIXME: this test fails because the redirect is vetoed. There are continued bugs with redirects when the original
-// request was cross-origin.
 ["http://localhost:8000/xmlhttprequest/resources/redirect-cors.php?url=http://localhost:8000/xmlhttprequest/resources/access-control-basic-allow-star.cgi&\
-  access-control-allow-origin=http://localhost:8000",
+  access-control-allow-origin=http://127.0.0.1:8000",

[yhirano, 2016/11/16 08:20:28]

Hm, the document origin is http://127.0.0.1:8000 and the setting has been wrong
for a long time, right? If so, should we replace all localhost:8000 in ACAO
headers as well?

[Jack Bates, 2016/11/20 18:51:11]

Done.

   withoutCredentials, noCustomHeader, succeeds],
 
 // Receives a redirect response with a URL containing the userinfo production.
@@ -78,7 +76,7 @@ var tests = [
   url=http://localhost:8000/xmlhttprequest/resources/access-control-basic-allow-star.cgi&\
   access-control-allow-origin=*&\
   access-control-allow-headers=x-webkit",
-  withoutCredentials, addCustomHeader, fails],
+  withoutCredentials, addCustomHeader, succeeds],
 
 // 3) Test same origin requests with a custom header that receive a same origin redirect.
 ["resources/redirect-cors.php?url=http://127.0.0.1:8000/xmlhttprequest/resources/get.txt",