browser test for kAccountsPrefAllowNewUser.

chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
index 92adcb52bd35ca703e52db9366338ebebe8c34d7..5f9149a75339a6bc28e224d859dedd455e26013d 100644
--- a/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/gaia_screen_handler.cc
@@ -917,10 +917,17 @@ SigninScreenHandlerDelegate* GaiaScreenHandler::Delegate() {
 }
 
 bool GaiaScreenHandler::IsRestrictiveProxy() const {
+  if (disable_restrictive_proxy_check_)
+    return false;
+
   return captive_portal_status_ ==
              NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_PORTAL ||
          captive_portal_status_ ==
              NetworkPortalDetector::CAPTIVE_PORTAL_STATUS_OFFLINE;
 }
 
+void GaiaScreenHandler::DisableRestrictiveProxyCheck() {
+  disable_restrictive_proxy_check_ = true;
+}
+
 }  // namespace chromeos