Make CrOS proxy configuration write prefs directly.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 647 matching lines @@
         'browser/chromeos/panels/panel_scroller.cc',
         'browser/chromeos/panels/panel_scroller.h',
         'browser/chromeos/panels/panel_scroller_container.cc',
         'browser/chromeos/panels/panel_scroller_container.h',
         'browser/chromeos/panels/panel_scroller_header.cc',
         'browser/chromeos/panels/panel_scroller_header.h',
         'browser/chromeos/plugin_selection_policy.cc',
         'browser/chromeos/plugin_selection_policy.h',
         'browser/chromeos/preferences.cc',
         'browser/chromeos/preferences.h',
-        'browser/chromeos/proxy_config_service.h',
         'browser/chromeos/proxy_config_service_impl.cc',
         'browser/chromeos/proxy_config_service_impl.h',
         'browser/chromeos/proxy_cros_settings_provider.cc',
         'browser/chromeos/proxy_cros_settings_provider.h',
         'browser/chromeos/setting_level_bubble.cc',
         'browser/chromeos/setting_level_bubble.h',
         'browser/chromeos/setting_level_bubble_view.cc',
         'browser/chromeos/setting_level_bubble_view.h',
         'browser/chromeos/status/clock_menu_button.cc',
         'browser/chromeos/status/clock_menu_button.h',
@@ skipping 3843 matching lines @@
       ],
     },
   ],
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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