Implement 'Do Not Track' header

chrome/chrome_tests.gypi

 # 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 2744 matching lines @@
         'browser/chromeos/login/wizard_in_process_browser_test.h',
         'browser/chromeos/media/media_player_browsertest.cc',
         'browser/chromeos/oom_priority_manager_browsertest.cc',
         'browser/chromeos/process_proxy/process_proxy_browsertest.cc',
         'browser/chromeos/ui/idle_logout_dialog_view_browsertest.cc',
         'browser/collected_cookies_browsertest.cc',
         'browser/content_settings/content_settings_browsertest.cc',
         'browser/crash_recovery_browsertest.cc',
         'browser/custom_handlers/protocol_handler_registry_browsertest.cc',
         'browser/debugger/devtools_sanity_browsertest.cc',
+        'browser/do_not_track_browsertest.cc',
         'browser/download/download_browsertest.cc',
         'browser/download/download_danger_prompt_browsertest.cc',
-        'browser/extensions/api/downloads/downloads_api_unittest.cc',
         'browser/download/download_query_unittest.cc',
         'browser/download/save_page_browsertest.cc',
         'browser/errorpage_browsertest.cc',
         'browser/extensions/active_tab_apitest.cc',
         'browser/extensions/alert_apitest.cc',
         'browser/extensions/all_urls_apitest.cc',
         'browser/extensions/api/app/app_apitest.cc',
         'browser/extensions/api/bluetooth/bluetooth_apitest_chromeos.cc',
         'browser/extensions/api/browsing_data/browsing_data_test.cc',
         'browser/extensions/api/cloud_print_private/cloud_print_private_apitest.cc',
         'browser/extensions/api/cookies/cookies_apitest.cc',
         'browser/extensions/api/context_menu/context_menu_apitest.cc',
         'browser/extensions/api/content_settings/content_settings_apitest.cc',
         'browser/extensions/api/debugger/debugger_apitest.cc',
         'browser/extensions/api/declarative/declarative_apitest.cc',
         'browser/extensions/api/dns/dns_apitest.cc',
         'browser/extensions/api/dns/mock_host_resolver_creator.cc',
         'browser/extensions/api/dns/mock_host_resolver_creator.h',
+        'browser/extensions/api/downloads/downloads_api_unittest.cc',
         'browser/extensions/api/extension_action/browser_action_apitest.cc',
         'browser/extensions/api/extension_action/page_action_apitest.cc',
         'browser/extensions/api/extension_action/page_as_browser_action_apitest.cc',
         'browser/extensions/api/extension_action/script_badge_apitest.cc',
         'browser/extensions/api/file_system/file_system_apitest.cc',
         'browser/extensions/api/font_settings/font_settings_apitest.cc',
         'browser/extensions/api/i18n/i18n_apitest.cc',
         'browser/extensions/api/identity/identity_apitest.cc',
         'browser/extensions/api/idle/idle_apitest.cc',
         'browser/extensions/api/idltest/idltest_apitest.cc',
@@ skipping 1966 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }