Add crostini_upgrader to the webui_closure_compile

This target is used by the CQ to typecheck javascript

Bug: none
Change-Id: I7655a135ac9816dbbf7b84b9d5c0331fda5d0ef0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379441
Auto-Submit: Fergus Dall <sidereal@google.com>
Reviewed-by: Nicholas Verne <nverne@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804968}

chrome/browser/resources/chromeos/BUILD.gn

@@ -45,6 +45,7 @@ group("closure_compile") {
     "add_supervision:closure_compile",
     "bluetooth_pairing_dialog:closure_compile",
     "crostini_installer:closure_compile",
+    "crostini_upgrader:closure_compile",
     "edu_login:closure_compile",
     "emulator:closure_compile",
     "gaia_action_buttons:closure_compile",