[New Tab Page] Change the mechanism to intercept online NTP errors

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'variables': {
     # There are two sections of sources:
     # * "Platform"-based sources (OS, toolkit, etc.)
     # * Feature/directory-based sources (e.g., history, printing)
 
@@ skipping 803 matching lines @@
       'browser/ui/proximity_auth/proximity_auth_error_bubble.h',
       'browser/ui/screen_capture_notification_ui.h',
       'browser/ui/search/instant_controller.cc',
       'browser/ui/search/instant_controller.h',
       'browser/ui/search/instant_page.cc',
       'browser/ui/search/instant_page.h',
       'browser/ui/search/instant_search_prerenderer.cc',
       'browser/ui/search/instant_search_prerenderer.h',
       'browser/ui/search/instant_tab.cc',
       'browser/ui/search/instant_tab.h',
+      'browser/ui/search/new_tab_page_interceptor_service_factory.cc',
+      'browser/ui/search/new_tab_page_interceptor_service_factory.h',
+      'browser/ui/search/new_tab_page_interceptor_service.cc',
+      'browser/ui/search/new_tab_page_interceptor_service.h',
       'browser/ui/search/search_ipc_router.cc',
       'browser/ui/search/search_ipc_router.h',
       'browser/ui/search/search_ipc_router_policy_impl.cc',
       'browser/ui/search/search_ipc_router_policy_impl.h',
       'browser/ui/search/search_model.cc',
       'browser/ui/search/search_model.h',
       'browser/ui/search/search_model_observer.h',
       'browser/ui/search/search_tab_helper.cc',
       'browser/ui/search/search_tab_helper.h',
       'browser/ui/search/search_tab_helper_delegate.cc',
@@ skipping 2293 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }