Add UpdaterSetup to official build targets.

Bug: 1001973
Change-Id: Ib123d0f68d0557a07de10eb57a29604db8c8d38f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793405Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694895}

BUILD.gn

@@ -841,6 +841,7 @@ if (is_win) {
       "//chrome/credential_provider",
       "//chrome/installer/gcapi",
       "//chrome/installer/mini_installer",
+      "//chrome/updater/win/installer",
       "//cloud_print",
       "//cloud_print/virtual_driver/win/port_monitor:copy_gcp_portmon_binaries",
       "//components/policy:pack_policy_templates",