Intorduce a separate preference for 'proxy server mode'

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1267 matching lines @@
         'browser/policy/mock_device_management_backend.h',
         'browser/preferences_mock_mac.cc',
         'browser/preferences_mock_mac.h',
         'browser/prefs/command_line_pref_store_unittest.cc',
         'browser/prefs/pref_change_registrar_unittest.cc',
         'browser/prefs/pref_member_unittest.cc',
         'browser/prefs/pref_notifier_impl_unittest.cc',
         'browser/prefs/pref_service_unittest.cc',
         'browser/prefs/pref_set_observer_unittest.cc',
         'browser/prefs/pref_value_store_unittest.cc',
+        'browser/prefs/proxy_prefs_unittest.cc',
         'browser/prefs/session_startup_pref_unittest.cc',
         'browser/prerender/prerender_interceptor_unittest.cc',
         'browser/prerender/prerender_manager_unittest.cc',
         'browser/printing/cloud_print/cloud_print_setup_source_unittest.cc',
         'browser/printing/print_dialog_cloud_unittest.cc',
         'browser/printing/print_job_unittest.cc',
         'browser/printing/print_preview_tab_controller_unittest.cc',
         'browser/process_info_snapshot_mac_unittest.cc',
         'browser/process_singleton_mac_unittest.cc',
         'browser/profiles/profile_manager_unittest.cc',
@@ skipping 2270 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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