Make NTP Promo invalid if text parameter is not in lookup table.

ios/chrome/browser/ui/ntp/notification_promo_whats_new.h

Index: ios/chrome/browser/ui/ntp/notification_promo_whats_new.h
diff --git a/ios/chrome/browser/ui/ntp/notification_promo_whats_new.h b/ios/chrome/browser/ui/ntp/notification_promo_whats_new.h
index 31a74f300eab4065ca199200a9c1e0b9fa4b79c1..b1b0f48630832a10a0cbe56d5d6a6e8333e01333 100644
--- a/ios/chrome/browser/ui/ntp/notification_promo_whats_new.h
+++ b/ios/chrome/browser/ui/ntp/notification_promo_whats_new.h
@@ -42,7 +42,6 @@ class NotificationPromoWhatsNew {
   bool valid() const { return valid_; }
   const std::string& promo_type() { return promo_type_; }
   const std::string& promo_text() { return promo_text_; }
-  const std::string& promo_name() { return promo_name_; }
   WhatsNewIcon icon() { return icon_; }
   bool IsURLPromo() const;
   const GURL& url() { return url_; }
@@ -78,9 +77,6 @@ class NotificationPromoWhatsNew {
   // Type of whats new promo.
   std::string promo_type_;
 
-  // Name of promo.
-  std::string promo_name_;
-
   // Icon of promo.
   WhatsNewIcon icon_;