ChromeOS: user whitelist check should happen before entering password.

chrome/browser/chromeos/login/ui/webui_login_display.cc

Index: chrome/browser/chromeos/login/ui/webui_login_display.cc
diff --git a/chrome/browser/chromeos/login/ui/webui_login_display.cc b/chrome/browser/chromeos/login/ui/webui_login_display.cc
index 264ef1457627ac7a85191c85ce8faf823e9490c4..a39ac27d012e03364fac4eaaa141a5294eb5d769 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_display.cc
+++ b/chrome/browser/chromeos/login/ui/webui_login_display.cc
@@ -340,5 +340,11 @@ void WebUILoginDisplay::OnUserActivity(const ui::Event* event) {
     delegate_->ResetPublicSessionAutoLoginTimer();
 }
 
+bool WebUILoginDisplay::IsUserWhitelisted(const std::string& user_id) {
+  DCHECK(delegate_);
+  if (delegate_)
+    return delegate_->IsUserWhitelisted(user_id);
+  return true;
+}
 
 }  // namespace chromeos