Create a about handler component.

components/components.gyp

 # 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': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
   },
   'includes': [
+    'about_handler.gypi',
     'auto_login_parser.gypi',
     'autofill.gypi',
     'bookmarks.gypi',
     'captive_portal.gypi',
     'cloud_devices.gypi',
     'component_updater.gypi',
     'content_settings.gypi',
     'crash.gypi',
     'cronet.gypi',
     'crx_file.gypi',
@@ skipping 145 matching lines @@
         'chrome_apps.gypi',
       ],
     }],
     ['enable_rlz_support==1', {
       'includes': [
         'rlz.gypi',
       ],
     }]
   ],
 }