aura: Remove apps from NTP4 and disable NTP4 intro bubble.

chrome/browser/ui/webui/ntp/new_tab_ui.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_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 24 matching lines @@
   // Sets up any experiment in which the NTP might want to participate.
   // The CWS footer link is one such example.
   static void SetupFieldTrials();
 
   // Returns whether or not to show the link to the CWS in the footer.
   static bool ShouldShowWebStoreFooterLink();
 
   // Returns whether or not to show the app install hint.
   static bool ShouldShowAppInstallHint();
 
+  // Returns whether or not to show the apps page.
+  static bool ShouldShowAppsPage();
+
   // Returns whether or not the "suggestions links page" is enabled.
   static bool IsSuggestionsPageEnabled();
 
   // Adds "url", "title", and "direction" keys on incoming dictionary, setting
   // title as the url as a fallback on empty title.
   static void SetURLTitleAndDirection(base::DictionaryValue* dictionary,
                                       const string16& title,
                                       const GURL& gurl);
 
   // Returns a pointer to a NewTabUI if the WebUIController object is a new tab
@@ skipping 77 matching lines @@
   bool showing_sync_bubble_;
 
   PrefChangeRegistrar pref_change_registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(NewTabUI);
 };
 
 extern const char kWebStoreLinkExperiment[];
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_UI_H_