Remove dependency on language detection library.

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 2681 matching lines @@
           ],
         }],  # OS == android
         ['enable_themes==0', {
           'sources!': [
             'browser/ui/webui/theme_source_unittest.cc',
           ],
           'sources/': [
             ['exclude', '^browser/themes/'],
           ],
         }],
+        ['enable_language_detection==0', {
+          'sources!': [
+            'browser/language_usage_metrics_unittest.cc',
+          ],
+        }],
         ['enable_plugin_installation==0', {
           'sources!': [
           ],
         }],
         ['enable_protector_service==0', {
           'sources/': [
             ['exclude', '^browser/protector/'],
           ],
         }],
         ['toolkit_views==1', {
@@ skipping 2245 matching lines @@
             'sync_integration_tests.isolate',
           ],
           'sources': [
             'sync_integration_tests.isolate',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }