Delete obsolete auto_login_infobar_delegate.

components/infobars/core/infobar_delegate.cc

Index: components/infobars/core/infobar_delegate.cc
diff --git a/components/infobars/core/infobar_delegate.cc b/components/infobars/core/infobar_delegate.cc
index de0ae136096213a5f6f28b0751533628a7dfce21..438924064ca61e401595dd5b911be02631780f34 100644
--- a/components/infobars/core/infobar_delegate.cc
+++ b/components/infobars/core/infobar_delegate.cc
@@ -54,10 +54,6 @@ bool InfoBarDelegate::ShouldExpire(const NavigationDetails& details) const {
 void InfoBarDelegate::InfoBarDismissed() {
 }
 
-AutoLoginInfoBarDelegate* InfoBarDelegate::AsAutoLoginInfoBarDelegate() {
-  return nullptr;
-}
-
 ConfirmInfoBarDelegate* InfoBarDelegate::AsConfirmInfoBarDelegate() {
   return nullptr;
 }