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

base/base.gyp

 # 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': {
     'chromium_code': 1,
   },
   'includes': [
     'base.gypi',
@@ skipping 146 matching lines @@
         'version_unittest.cc',
         'vlog_unittest.cc',
         'waitable_event_unittest.cc',
         'waitable_event_watcher_unittest.cc',
         'watchdog_unittest.cc',
         'weak_ptr_unittest.cc',
         'win_util_unittest.cc',
         'win/event_trace_consumer_unittest.cc',
         'win/event_trace_controller_unittest.cc',
         'win/event_trace_provider_unittest.cc',
+        'win/i18n_unittest.cc',
         'win/pe_image_unittest.cc',
         'win/registry_unittest.cc',
         'win/scoped_bstr_unittest.cc',
         'win/scoped_comptr_unittest.cc',
         'win/scoped_variant_unittest.cc',
         'worker_pool_unittest.cc',
       ],
       'include_dirs': [
         # word_iterator.h (used by word_iterator_unittest.cc) leaks an ICU
         # #include for unicode/uchar.h.  This should probably be cleaned up.
@@ skipping 146 matching lines @@
       ],
     }],
   ],
 }
 
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