Remove unused CookiePreferences from report sender and never send cookies

ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc

Index: ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
diff --git a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
index 65b183bb569b83cd8577f65428ea7bf589ec4223..e2899f5829cf89f6881db5a1e231a1fa95aa2bb5 100644
--- a/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
+++ b/ios/chrome/browser/browser_state/chrome_browser_state_io_data.cc
@@ -363,8 +363,8 @@ void ChromeBrowserStateIOData::Init(
           pool->GetSequenceToken(), base::SequencedWorkerPool::BLOCK_SHUTDOWN),
       IsOffTheRecord()));
 
-  certificate_report_sender_.reset(new net::ReportSender(
-      main_request_context_.get(), net::ReportSender::DO_NOT_SEND_COOKIES));
+  certificate_report_sender_.reset(

[sdefresne, 2017/04/28 10:12:54]

nit: can you change this to use base::MakeUnique?

  certificate_report_sender_ = base::MakeUnique<net::ReportSender>(
      main_request_context_.get());

[meacer, 2017/04/28 19:03:07]

Done.

+      new net::ReportSender(main_request_context_.get()));
   transport_security_state_->SetReportSender(certificate_report_sender_.get());
 
   // Take ownership over these parameters.