Remove prerender cookie store, part 4.

chromecast/net/connectivity_checker.cc

Index: chromecast/net/connectivity_checker.cc
diff --git a/chromecast/net/connectivity_checker.cc b/chromecast/net/connectivity_checker.cc
index 4047770007c67fd60db9162ad00aba9c332e3521..e6e1b409867f5ee374d2cbc1fba68a3a60ad5b0d 100644
--- a/chromecast/net/connectivity_checker.cc
+++ b/chromecast/net/connectivity_checker.cc
@@ -112,7 +112,7 @@ void ConnectivityChecker::Check() {
 
   VLOG(1) << "Connectivity check: url=" << *connectivity_check_url_;
   url_request_ = url_request_context_->CreateRequest(
-      *connectivity_check_url_, net::MAXIMUM_PRIORITY, this, NULL);
+      *connectivity_check_url_, net::MAXIMUM_PRIORITY, this);
   url_request_->set_method("HEAD");
   url_request_->Start();
 }