Add method for identifying different InfoBars

ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm

Index: ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
diff --git a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
index b15e427d47b2fc3859de50d6dfe7626f258cbc15..045bec9ea253947a1343906b3d92bbad5b487c4a 100644
--- a/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
+++ b/ios/chrome/browser/passwords/ios_chrome_save_password_infobar_delegate.mm
@@ -55,6 +55,11 @@ IOSChromeSavePasswordInfoBarDelegate::GetInfoBarType() const {
   return PAGE_ACTION_TYPE;
 }
 
+infobars::InfoBarDelegate::InfoBarIdentifier
+IOSChromeSavePasswordInfoBarDelegate::GetIdentifier() const {
+  return IOS_CHROME_SAVE_PASSWORD_INFOBAR_DELEGATE;
+}
+
 base::string16 IOSChromeSavePasswordInfoBarDelegate::GetMessageText() const {
   if (is_smart_lock_branding_enabled_) {
     return l10n_util::GetStringUTF16(