Settings Overides -- warn user when extensions override their NTP.

chrome/browser/ui/views/settings_api_bubble_helper_views.h

 // Copyright (c) 2014 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_BROWSER_UI_VIEWS_SETTINGS_API_BUBBLE_HELPER_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_SETTINGS_API_BUBBLE_HELPER_VIEWS_H_
 
 struct AutocompleteMatch;
 class Browser;
 class Profile;
@@ skipping 10 matching lines @@
 void MaybeShowExtensionControlledHomeNotification(Browser* browser);
 
 // Shows a bubble notifying the user that the search engine is controlled by an
 // extension. This bubble is shown only on the first search after the
 // controlling extension takes effect.
 void MaybeShowExtensionControlledSearchNotification(
     Profile* profile,
     content::WebContents* web_contents,
     const AutocompleteMatch& match);
 
+// Shows a bubble notifying the user that the new tab page is controlled by an
+// extension. This bubble is shown only the first time the new tab page is shown
+// after the controlling extension takes effect.
+void MaybeShowExtensionControlledNewTabPage(
+    Browser* browser,
+    content::WebContents* web_contents);
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_UI_VIEWS_SETTINGS_API_BUBBLE_HELPER_VIEWS_H_