[Signin Error Dialog] (3/3) Added the triggering code

chrome/browser/ui/signin_view_controller.cc

Index: chrome/browser/ui/signin_view_controller.cc
diff --git a/chrome/browser/ui/signin_view_controller.cc b/chrome/browser/ui/signin_view_controller.cc
index b7b44d87f57bc7d6f8c9bd068b46c6e9736e4390..6ca3c480574e19145151d0998d3cb3ec63687081 100644
--- a/chrome/browser/ui/signin_view_controller.cc
+++ b/chrome/browser/ui/signin_view_controller.cc
@@ -35,6 +35,14 @@ void SigninViewController::ShowModalSyncConfirmationDialog(Browser* browser) {
                                                                    browser);
 }
 
+void SigninViewController::ShowModalSigninErrorDialog(Browser* browser) {
+  CloseModalSignin();
+  // The delegate will delete itself on request of the UI code when the widget
+  // is closed.
+  signin_view_controller_delegate_ =
+      SigninViewControllerDelegate::CreateSigninErrorDelegate(this, browser);
+}
+
 void SigninViewController::CloseModalSignin() {
   if (signin_view_controller_delegate_)
     signin_view_controller_delegate_->CloseModalSignin();