Enforce SafetyMode for YouTube if prefs::kForceSafeSearch is on.

chrome/chrome_browser.gypi

 # Copyright 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 805 matching lines @@
       'browser/net/pref_proxy_config_tracker.cc',
       'browser/net/pref_proxy_config_tracker.h',
       'browser/net/pref_proxy_config_tracker_impl.cc',
       'browser/net/pref_proxy_config_tracker_impl.h',
       'browser/net/probe_message.cc',
       'browser/net/probe_message.h',
       'browser/net/proxy_service_factory.cc',
       'browser/net/proxy_service_factory.h',
       'browser/net/referrer.cc',
       'browser/net/referrer.h',
+      'browser/net/safe_search_util.cc',
+      'browser/net/safe_search_util.h',
       'browser/net/service_providers_win.cc',
       'browser/net/service_providers_win.h',
       'browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.cc',
       'browser/net/spdyproxy/data_reduction_proxy_chrome_configurator.h',
       'browser/net/spdyproxy/data_reduction_proxy_settings_android.cc',
       'browser/net/spdyproxy/data_reduction_proxy_settings_android.h',
       'browser/net/spdyproxy/data_reduction_proxy_settings_factory_android.cc',
       'browser/net/spdyproxy/data_reduction_proxy_settings_factory_android.h',
       'browser/net/sqlite_server_bound_cert_store.cc',
       'browser/net/sqlite_server_bound_cert_store.h',
@@ skipping 2771 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }