The UI language rather than the locale is now used to pick Chrome's language ...

chrome/chrome_installer_util.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.
 
 {
   'target_defaults': {
     'variables': {
       'installer_util_target': 0,
     },
     'target_conditions': [
@@ skipping 17 matching lines @@
           'installer/util/google_chrome_sxs_distribution.cc',
           'installer/util/google_chrome_sxs_distribution.h',
           'installer/util/google_update_constants.cc',
           'installer/util/google_update_constants.h',
           'installer/util/google_update_settings.cc',
           'installer/util/google_update_settings.h',
           'installer/util/install_util.cc',
           'installer/util/install_util.h',
           'installer/util/l10n_string_util.cc',
           'installer/util/l10n_string_util.h',
+          'installer/util/language_selector.cc',
+          'installer/util/language_selector.h',
           'installer/util/master_preferences_constants.cc',
           'installer/util/master_preferences_constants.h',
           'installer/util/move_tree_work_item.cc',
           'installer/util/move_tree_work_item.h',
           'installer/util/self_reg_work_item.cc',
           'installer/util/self_reg_work_item.h',
           'installer/util/set_reg_value_work_item.cc',
           'installer/util/set_reg_value_work_item.h',
           'installer/util/util_constants.cc',
           'installer/util/util_constants.h',
@@ skipping 106 matching lines @@
       ],
     }],
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: