Inject JSON parsing in WebResource as a callback rather than inheritance

ios/chrome/ios_chrome.gyp

 # Copyright 2014 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 421 matching lines @@
         'browser/updatable_config/updatable_config_base.h',
         'browser/updatable_config/updatable_config_base.mm',
         'browser/updatable_config/updatable_dictionary.h',
         'browser/updatable_config/updatable_dictionary.mm',
         'browser/web/dom_altering_lock.h',
         'browser/web/dom_altering_lock.mm',
         'browser/web/web_view_type_util.h',
         'browser/web/web_view_type_util.mm',
         'browser/web_data_service_factory.cc',
         'browser/web_data_service_factory.h',
-        'browser/web_resource/ios_web_resource_service.cc',
-        'browser/web_resource/ios_web_resource_service.h',
         'browser/xcallback_parameters.h',
         'browser/xcallback_parameters.mm',
       ],
       'conditions': [
         ['enable_rlz==1', {
           'dependencies': [
             '../../components/components.gyp:rlz',
             'ios_chrome_browser_rlz',
           ],
         }],
@@ skipping 103 matching lines @@
             '../../components/components.gyp:omnibox_browser',
             '../../components/components.gyp:rlz',
             '../../components/components.gyp:search_engines',
             '../../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }