Provide mutable members of UrlRequestContext via pure-virtual interface

net/net.gyp

 # Copyright (c) 2012 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': {
     'chromium_code': 1,
 
     'linux_link_kerberos%': 0,
     'conditions': [
@@ skipping 799 matching lines @@
         'udp/udp_socket_libevent.h',
         'udp/udp_socket_win.cc',
         'udp/udp_socket_win.h',
         'url_request/data_protocol_handler.cc',
         'url_request/data_protocol_handler.h',
         'url_request/file_protocol_handler.cc',
         'url_request/file_protocol_handler.h',
         'url_request/fraudulent_certificate_reporter.h',
         'url_request/ftp_protocol_handler.cc',
         'url_request/ftp_protocol_handler.h',
+        'url_request/http_user_agent_settings.h',
+        'url_request/static_http_user_agent_settings.cc',
+        'url_request/static_http_user_agent_settings.h',
         'url_request/url_fetcher.cc',
         'url_request/url_fetcher.h',
         'url_request/url_fetcher_core.cc',
         'url_request/url_fetcher_core.h',
         'url_request/url_fetcher_delegate.cc',
         'url_request/url_fetcher_delegate.h',
         'url_request/url_fetcher_factory.h',
         'url_request/url_fetcher_impl.cc',
         'url_request/url_fetcher_impl.h',
         'url_request/url_request.cc',
@@ skipping 1555 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'net_unittests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],
 }