Warn about Linux distributions that are no longer supported

This change doesn't actually bump the requirement; it just adds a
nag bar.

R=thestig

Bug: None
Change-Id: If6a00e1376f040bc4e79b51dfa0eea8b32048409
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3600242
Reviewed-by: Lei Zhang <[email protected]>
Commit-Queue: Thomas Anderson <[email protected]>
Cr-Commit-Position: refs/heads/main@{#998581}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 767be6b..58e186aa 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -2570,6 +2570,7 @@
 
   if (is_chromeos) {
     sources += [
+      "obsolete_system/obsolete_system_stub.cc",
       "policy/messaging_layer/util/manual_test_heartbeat_event.cc",
       "policy/messaging_layer/util/manual_test_heartbeat_event.h",
       "policy/messaging_layer/util/manual_test_heartbeat_event_factory.cc",
@@ -5976,7 +5977,6 @@
       "enterprise/signals/device_info_fetcher_linux.h",
       "first_run/first_run_internal_linux.cc",
       "memory_details_linux.cc",
-      "obsolete_system/obsolete_system_stub.cc",
       "policy/browser_dm_token_storage_linux.cc",
       "policy/browser_dm_token_storage_linux.h",
     ]
@@ -6367,6 +6367,7 @@
     sources += [
       "chrome_browser_main_extra_parts_linux.cc",
       "chrome_browser_main_extra_parts_linux.h",
+      "obsolete_system/obsolete_system_linux.cc",
     ]
   }