[CUPS] Put the CUPS settings UI behind a command line flag --enable-native-cups.

chrome/browser/resources/settings/printing_page/compiled_resources2.gyp

 # Copyright 2016 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.
 {
   'targets': [
     {
       'target_name': 'cloud_printers',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
       ],
@@ skipping 30 matching lines @@
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:icon',
         'cups_printers_browser_proxy',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'printing_page',
       'dependencies': [
+        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
         '../compiled_resources2.gyp:route',
         '../settings_page/compiled_resources2.gyp:settings_animated_pages',
         'cups_printer_details_page',
       ],
       'includes': ['../../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }