Implement a background downloader using BITS in Windows Chrome.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index fcbcb8577f1ef9f3241aea72d82069afcf00db5a..32a4695a39201f1c2ed7c1d4cf975e8eb8356b5e 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -423,6 +423,8 @@
         'browser/command_updater_delegate.h',
         'browser/common/cancelable_request.cc',
         'browser/common/cancelable_request.h',
+        'browser/component_updater/background_downloader_win.cc',
+        'browser/component_updater/background_downloader_win.h',
         'browser/component_updater/component_patcher.cc',
         'browser/component_updater/component_patcher.h',
         'browser/component_updater/component_patcher_operation.cc',
@@ -433,8 +435,6 @@
         'browser/component_updater/component_updater_configurator.h',
         'browser/component_updater/component_unpacker.cc',
         'browser/component_updater/component_unpacker.h',
-        'browser/component_updater/update_response.cc',
-        'browser/component_updater/update_response.h',
         'browser/component_updater/component_updater_ping_manager.cc',
         'browser/component_updater/component_updater_ping_manager.h',
         'browser/component_updater/component_updater_service.cc',
@@ -458,6 +458,8 @@
         'browser/component_updater/recovery_component_installer.h',
         'browser/component_updater/swiftshader_component_installer.cc',
         'browser/component_updater/swiftshader_component_installer.h',
+        'browser/component_updater/update_response.cc',
+        'browser/component_updater/update_response.h',
         'browser/component_updater/url_fetcher_downloader.cc',
         'browser/component_updater/url_fetcher_downloader.h',
         'browser/component_updater/widevine_cdm_component_installer.cc',