Delete old files after an update.

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 141 matching lines @@
       "chromium_binaries_distribution.cc",
       "chromium_binaries_distribution.h",
       "conditional_work_item_list.cc",
       "conditional_work_item_list.h",
       "copy_tree_work_item.cc",
       "copy_tree_work_item.h",
       "create_dir_work_item.cc",
       "create_dir_work_item.h",
       "create_reg_key_work_item.cc",
       "create_reg_key_work_item.h",
+      "delete_old_versions.cc",
+      "delete_old_versions.h",
       "delete_reg_key_work_item.cc",
       "delete_reg_key_work_item.h",
       "delete_reg_value_work_item.cc",
       "delete_reg_value_work_item.h",
       "delete_tree_work_item.cc",
       "delete_tree_work_item.h",
       "duplicate_tree_detector.cc",
       "duplicate_tree_detector.h",
       "firewall_manager_win.cc",
       "firewall_manager_win.h",
@@ skipping 112 matching lines @@
     sources = [
       "../setup/compat_checks_unittest.cc",
       "advanced_firewall_manager_win_unittest.cc",
       "beacons_unittest.cc",
       "callback_work_item_unittest.cc",
       "channel_info_unittest.cc",
       "copy_tree_work_item_unittest.cc",
       "create_dir_work_item_unittest.cc",
       "create_reg_key_work_item_unittest.cc",
       "delete_after_reboot_helper_unittest.cc",
+      "delete_old_versions_unittest.cc",
       "delete_reg_key_work_item_unittest.cc",
       "delete_reg_value_work_item_unittest.cc",
       "delete_tree_work_item_unittest.cc",
       "duplicate_tree_detector_unittest.cc",
       "fake_installation_state.h",
       "fake_product_state.h",
       "google_update_settings_unittest.cc",
       "install_util_unittest.cc",
       "installation_validation_helper.cc",
       "installation_validation_helper.h",
@@ skipping 39 matching lines @@
     ]
 
     data = [
       "//chrome/test/data/extensions/",
       "//chrome/test/data/installer/",
     ]
 
     # TODO(GYP) manifest: $(ProjectDir)\\installer\\mini_installer\\mini_installer.exe.manifest
   }
 }  # is_win