Use chrome.networkingPrivate in chrome://network

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 981 matching lines @@
       'browser/ui/webui/chromeos/login/user_image_screen_handler.cc',
       'browser/ui/webui/chromeos/login/user_image_screen_handler.h',
       'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.cc',
       'browser/ui/webui/chromeos/login/wrong_hwid_screen_handler.h',
       'browser/ui/webui/chromeos/touch_view_controller_delegate.cc',
       'browser/ui/webui/chromeos/touch_view_controller_delegate.h',
       'browser/ui/webui/chromeos/mobile_setup_dialog.cc',
       'browser/ui/webui/chromeos/mobile_setup_dialog.h',
       'browser/ui/webui/chromeos/mobile_setup_ui.cc',
       'browser/ui/webui/chromeos/mobile_setup_ui.h',
-      'browser/ui/webui/chromeos/network_config_message_handler.cc',
-      'browser/ui/webui/chromeos/network_config_message_handler.h',
       'browser/ui/webui/chromeos/network_ui.cc',
       'browser/ui/webui/chromeos/network_ui.h',
       'browser/ui/webui/chromeos/nfc_debug_ui.cc',
       'browser/ui/webui/chromeos/nfc_debug_ui.h',
       'browser/ui/webui/chromeos/power_ui.cc',
       'browser/ui/webui/chromeos/power_ui.h',
       'browser/ui/webui/chromeos/provided_file_systems_ui.cc',
       'browser/ui/webui/chromeos/provided_file_systems_ui.h',
       'browser/ui/webui/chromeos/proxy_settings_ui.cc',
       'browser/ui/webui/chromeos/proxy_settings_ui.h',
@@ skipping 2120 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }