Create a about handler component.

components/about_handler.gypi

 # Copyright 2015 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': [
     {
-      'target_name': 'browsing_data',
+      # GN version: //components/about_handler
+      'target_name': 'about_handler',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
-        '../content/content.gyp:content_browser',
         '../net/net.gyp:net',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         # Note: sources list duplicated in GN build.
-        'browsing_data/storage_partition_http_cache_data_remover.cc',
-        'browsing_data/storage_partition_http_cache_data_remover.h',
+        'about_handler/about_protocol_handler.cc',
+        'about_handler/about_protocol_handler.h',
+        'about_handler/url_request_about_job.cc',
+        'about_handler/url_request_about_job.h',
       ],
     },
   ],
 }