Remove FILE_MANAGER_EXTENSION and related configuration. They can be folded back to Chrome OS as co…

chrome/chrome_tests_unit.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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 2168 matching lines @@
             # be fixed by creating a separate unit test target, or by deleting
             # the test.
             'browser/ui/libgtk2ui/x11_input_method_context_impl_gtk2_unittest.cc'
           ],
         }],
         ['enable_task_manager==0', {
           'sources/': [
             ['exclude', '^browser/task_manager/'],
           ],
         }],
-        ['file_manager_extension==0', {
+        ['chromeos==0', {
           'sources!': [
             'browser/ui/views/select_file_dialog_extension_unittest.cc',
           ],
         }],
         ['enable_mdns == 1', {
             'sources': [
               'utility/local_discovery/local_domain_resolver_unittest.cc',
               'utility/local_discovery/service_discovery_client_unittest.cc',
               'browser/local_discovery/privet_device_lister_unittest.cc',
               'browser/local_discovery/privet_notifications_unittest.cc',
@@ skipping 696 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }