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

chrome/browser/ui/signin_view_controller_delegate.h

Index: chrome/browser/ui/signin_view_controller_delegate.h
diff --git a/chrome/browser/ui/signin_view_controller_delegate.h b/chrome/browser/ui/signin_view_controller_delegate.h
index 445a60f4357c7f78083ebcc552cb93bc77de022c..e8f8759176701f2c1543de5b0a9f17c0c4782d11 100644
--- a/chrome/browser/ui/signin_view_controller_delegate.h
+++ b/chrome/browser/ui/signin_view_controller_delegate.h
@@ -34,6 +34,10 @@ class SigninViewControllerDelegate : public content::WebContentsDelegate {
       SigninViewController* signin_view_controller,
       Browser* browser);
 
+  static SigninViewControllerDelegate* CreateSigninErrorDelegate(
+      SigninViewController* signin_view_controller,
+      Browser* browser);
+
   void CloseModalSignin();
 
   // Either navigates back in the signin flow if the history state allows it or