Add best-effort/allow rollback flags on WorkItem.

chrome/installer/util/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/chrome_build.gni")
 import("//testing/test.gni")
 
 # This file deliberately has no default "util" target so dependants have to
 # specify with the ":with_no_strings" or ":with_rc_strings" variants. Random
 # code that ends up getting linked into chrome proper should depend on the
@@ skipping 318 matching lines @@
       "self_cleaning_temp_dir_unittest.cc",
       "set_reg_value_work_item_unittest.cc",
       "shell_util_unittest.cc",
       "test_app_registration_data.cc",
       "test_app_registration_data.h",
       "uninstall_metrics_unittest.cc",
       "wmi_unittest.cc",
       "work_item_list_unittest.cc",
       "work_item_mocks.cc",
       "work_item_mocks.h",
+      "work_item_unittest.cc",
     ]
 
     deps = [
       ":with_rc_strings",
       "//base",
       "//base:i18n",
       "//base/test:test_support",
       "//chrome:other_version",
       "//chrome/installer/setup:lib",
       "//chrome/installer/test:alternate_version_generator_lib",
       "//components/variations",
       "//testing/gmock",
       "//testing/gtest",
     ]
 
     data = [
       "//chrome/test/data/extensions/",
       "//chrome/test/data/installer/",
     ]
 
     # TODO(GYP) manifest: $(ProjectDir)\\installer\\mini_installer\\mini_installer.exe.manifest
   }
 }  # is_win