CORS: change userinfo tests due to URL parser changes

[annevk]

In particular empty string password is now the same as not having a
password.

[wpt-pr-bot]

Notifying @hillbrad, @jdm, @odinho, and @zqzhang. (Learn how reviewing works.)

[ghost]

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Firefox (nightly channel)

Testing web-platform-tests at revision 15a68d9
Using browser at version BuildID 20170312110221; SourceStamp 3154da520af568d4da3de62bc26fbf97a1317f51
Starting 10 test iterations
All results were stable

All results

1 test ran

/cors/redirect-userinfo.htm

Subtest	Results	Messages
	OK
Disallow redirect with userinfo (user:pass@)	PASS
Disallow redirect with userinfo (user:@)	PASS
Disallow redirect with userinfo (user@)	PASS
Allow redirect without userinfo (:@ is trimmed during URL parsing)	FAIL	assert_unreached: Reached unreachable code
Disallow redirect with userinfo (:pass@)	PASS
Allow redirect without userinfo (@ is trimmed during URL parsing)	PASS

[ghost]

View the complete job log.

Chrome (unstable channel)

Testing web-platform-tests at revision 15a68d9
Using browser at version 58.0.3029.14 dev
Starting 10 test iterations
All results were stable

All results

1 test ran

/cors/redirect-userinfo.htm

Subtest	Results	Messages
	OK
Disallow redirect with userinfo (user:pass@)	PASS
Disallow redirect with userinfo (user:@)	PASS
Disallow redirect with userinfo (user@)	PASS
Allow redirect without userinfo (:@ is trimmed during URL parsing)	PASS
Disallow redirect with userinfo (:pass@)	PASS
Allow redirect without userinfo (@ is trimmed during URL parsing)	PASS

[annevk]

This makes Chrome pass all these tests. Firefox ends up failing one, but will pass that once it fixes its URL parser. WebKit: https://bugs.webkit.org/show_bug.cgi?id=169540.