Split content settings pref related logic into a separate class

components/content_settings.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/content_settings/core/browser
       'target_name': 'content_settings_core_browser',
       'type': 'static_library',
@@ skipping 20 matching lines @@
         'content_settings/core/browser/content_settings_details.h',
         'content_settings/core/browser/content_settings_observable_provider.cc',
         'content_settings/core/browser/content_settings_observable_provider.h',
         'content_settings/core/browser/content_settings_observer.h',
         'content_settings/core/browser/content_settings_origin_identifier_value_map.cc',
         'content_settings/core/browser/content_settings_origin_identifier_value_map.h',
         'content_settings/core/browser/content_settings_override_provider.cc',
         'content_settings/core/browser/content_settings_override_provider.h',
         'content_settings/core/browser/content_settings_policy_provider.cc',
         'content_settings/core/browser/content_settings_policy_provider.h',
+        'content_settings/core/browser/content_settings_pref.cc',
+        'content_settings/core/browser/content_settings_pref.h',
         'content_settings/core/browser/content_settings_pref_provider.cc',
         'content_settings/core/browser/content_settings_pref_provider.h',
         'content_settings/core/browser/content_settings_provider.h',
         'content_settings/core/browser/content_settings_rule.cc',
         'content_settings/core/browser/content_settings_rule.h',
         'content_settings/core/browser/content_settings_usages_state.cc',
         'content_settings/core/browser/content_settings_usages_state.h',
         'content_settings/core/browser/content_settings_utils.cc',
         'content_settings/core/browser/content_settings_utils.h',
         'content_settings/core/browser/host_content_settings_map.cc',
@@ skipping 44 matching lines @@
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
         'content_settings/core/test/content_settings_test_utils.cc',
         'content_settings/core/test/content_settings_test_utils.h',
       ],
     },
   ],
 }