With browser instant extended enabled, signing in should redirect to chrome://apps instead of to NT…

chrome/browser/ui/webui/sync_promo/sync_promo_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_SYNC_PROMO_SYNC_PROMO_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_SYNC_PROMO_SYNC_PROMO_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
 class Profile;
 class PrefRegistrySyncable;
 
 // The Web UI handler for chrome://signin.
 class SyncPromoUI : public content::WebUIController {
  public:
   // Please keep this in sync with enums in sync_promo_trial.cc.
   enum Source {
     SOURCE_START_PAGE = 0, // This must be first.
     SOURCE_NTP_LINK,
     SOURCE_MENU,
     SOURCE_SETTINGS,
     SOURCE_EXTENSION_INSTALL_BUBBLE,
     SOURCE_WEBSTORE_INSTALL,
     SOURCE_APP_LAUNCHER,
+    SOURCE_APPS_PAGE_LINK,
     SOURCE_UNKNOWN, // This must be last.
   };
 
   // Constructs a SyncPromoUI.
   explicit SyncPromoUI(content::WebUI* web_ui);
 
   // Returns true if the sync promo should be visible.
   // |profile| is the profile of the tab the promo would be shown on.
   static bool ShouldShowSyncPromo(Profile* profile);
 
@@ skipping 42 matching lines @@
   static bool UseWebBasedSigninFlow();
 
   // Forces UseWebBasedSigninFlow() to return true when set; used in tests only.
   static void ForceWebBasedSigninFlowForTesting(bool force);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncPromoUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SYNC_PROMO_SYNC_PROMO_UI_H_