Remove NTP4 intro bubble

chrome/common/chrome_notification_types.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #pragma once
 
 #include "content/public/browser/notification_types.h"
 
@@ skipping 365 matching lines @@
 
   // This is broadcast after the preference subsystem has completed
   // asynchronous initalization of a PrefService.
   NOTIFICATION_PREF_INITIALIZATION_COMPLETED,
 
   // The state of a web resource has been changed. A resource may have been
   // added, removed, or altered. Source is WebResourceService, and the
   // details are NoDetails.
   NOTIFICATION_PROMO_RESOURCE_STATE_CHANGED,
 
-  // The number of times that NTP4 bubble is shown has been changed. The NTP
-  // resource cache has to be refreshed to remove the NTP4 bubble.
-  NTP4_INTRO_PREF_CHANGED,
-
   // Autocomplete ------------------------------------------------------------
 
   // Sent by the autocomplete controller when done.  The source is the
   // AutocompleteController, the details not used.
   NOTIFICATION_AUTOCOMPLETE_CONTROLLER_RESULT_READY,
 
   // This is sent when an item of the Omnibox popup is selected. The source
   // is the profile.
   NOTIFICATION_OMNIBOX_OPENED_URL,
 
@@ skipping 769 matching lines @@
   // Currently only Content and Chrome define and use notifications.
   // Custom notifications not belonging to Content and Chrome should start
   // from here.
   NOTIFICATION_CHROME_END,
 };
 
 }  // namespace chrome
 
 
 #endif  // CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_