Tests renderer: post chain redirection.
requested url: http://www.example.com/
requested url: http://www.example.com/1
requested url: http://www.example.com/2
requested url: http://www.example.com/3
requested url: http://www.example.com/4
<p>Pass</p>
Requested methods: 5
 GET
 POST
 POST
 POST
 POST
Frames: 1
 frameId=MainFrame
  url=http://www.example.com/
  url=http://www.example.com/2
  url=http://www.example.com/4
ScheduledNavigations: 1
 frameId=MainFrame
  url=http://www.example.com/1 reason=formSubmissionPost
  url=http://www.example.com/3 reason=formSubmissionPost