[Extensions] Move Feature channel code into //extensions

chrome/chrome_common.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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 137 matching lines @@
       'common/extensions/chrome_manifest_url_handlers.h',
       'common/extensions/chrome_utility_extensions_messages.h',
       'common/extensions/command.cc',
       'common/extensions/command.h',
       'common/extensions/extension_constants.cc',
       'common/extensions/extension_constants.h',
       'common/extensions/extension_metrics.cc',
       'common/extensions/extension_metrics.h',
       'common/extensions/extension_process_policy.cc',
       'common/extensions/extension_process_policy.h',
-      'common/extensions/features/chrome_channel_feature_filter.cc',
-      'common/extensions/features/chrome_channel_feature_filter.h',
-      'common/extensions/features/feature_channel.cc',
-      'common/extensions/features/feature_channel.h',
       'common/extensions/features/feature_util.cc',
       'common/extensions/features/feature_util.h',
       'common/extensions/image_writer/image_writer_util_mac.cc',
       'common/extensions/image_writer/image_writer_util_mac.h',
       'common/extensions/manifest_handlers/app_icon_color_info.cc',
       'common/extensions/manifest_handlers/app_icon_color_info.h',
       'common/extensions/manifest_handlers/app_launch_info.cc',
       'common/extensions/manifest_handlers/app_launch_info.h',
       'common/extensions/manifest_handlers/automation.cc',
       'common/extensions/manifest_handlers/automation.h',
@@ skipping 520 matching lines @@
           ],
           'dependencies': [
             'installer_util',
             '../base/base.gyp:base',
           ],
         },
       ],
     }],
   ],
 }