Move content_settings_custom_extension_provider.* to c/b/extensions/api/content_settings/

chrome/chrome_browser_extensions.gypi

 # Copyright (c) 2013 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': {
     'chrome_browser_extensions_chromeos_sources': [
       'browser/extensions/api/diagnostics/diagnostics_api.cc',
       'browser/extensions/api/diagnostics/diagnostics_api.h',
       'browser/extensions/api/diagnostics/diagnostics_api_chromeos.cc',
@@ skipping 140 matching lines @@
       'browser/extensions/api/command_line_private/command_line_private_api.cc',
       'browser/extensions/api/command_line_private/command_line_private_api.h',
       'browser/extensions/api/commands/command_service.cc',
       'browser/extensions/api/commands/command_service.h',
       'browser/extensions/api/commands/commands.cc',
       'browser/extensions/api/commands/commands.h',
       'browser/extensions/api/content_settings/content_settings_api.cc',
       'browser/extensions/api/content_settings/content_settings_api.h',
       'browser/extensions/api/content_settings/content_settings_api_constants.cc',
       'browser/extensions/api/content_settings/content_settings_api_constants.h',
+      'browser/extensions/api/content_settings/content_settings_custom_extension_provider.cc',
+      'browser/extensions/api/content_settings/content_settings_custom_extension_provider.h',
       'browser/extensions/api/content_settings/content_settings_helpers.cc',
       'browser/extensions/api/content_settings/content_settings_helpers.h',
       'browser/extensions/api/content_settings/content_settings_service.cc',
       'browser/extensions/api/content_settings/content_settings_service.h',
       'browser/extensions/api/content_settings/content_settings_store.cc',
       'browser/extensions/api/content_settings/content_settings_store.h',
       'browser/extensions/api/context_menus/context_menus_api.cc',
       'browser/extensions/api/context_menus/context_menus_api.h',
       'browser/extensions/api/context_menus/context_menus_api_helpers.cc',
       'browser/extensions/api/context_menus/context_menus_api_helpers.h',
@@ skipping 951 matching lines @@
           ],
         }, {  # use_brlapi==0
           'sources': [
             'browser/extensions/api/braille_display_private/braille_controller_stub.cc',
           ],
         }],
       ],
     },
   ],
 }