Fix race issue in ArcAuthService.

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index ade3609a36c256226ae1fe40216ec753090cfda0..823106535c8e8ffa84c6188f343ab052d1d85fc2 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -207,8 +207,6 @@ source_set("chromeos") {
     "app_mode/kiosk_session_plugin_handler_delegate.h",
     "app_mode/startup_app_launcher.cc",
     "app_mode/startup_app_launcher.h",
-    "arc/arc_auth_code_fetcher.cc",
-    "arc/arc_auth_code_fetcher.h",
     "arc/arc_auth_context.cc",
     "arc/arc_auth_context.h",
     "arc/arc_auth_service.cc",
@@ -221,8 +219,13 @@ source_set("chromeos") {
     "arc/arc_session_manager.h",
     "arc/arc_support_host.cc",
     "arc/arc_support_host.h",
-    "arc/auth/arc_robot_auth.cc",
-    "arc/auth/arc_robot_auth.h",
+    "arc/auth/arc_auth_code_fetcher.h",
+    "arc/auth/arc_background_auth_code_fetcher.cc",
+    "arc/auth/arc_background_auth_code_fetcher.h",
+    "arc/auth/arc_manual_auth_code_fetcher.cc",
+    "arc/auth/arc_manual_auth_code_fetcher.h",
+    "arc/auth/arc_robot_auth_code_fetcher.cc",
+    "arc/auth/arc_robot_auth_code_fetcher.h",
     "arc/downloads_watcher/arc_downloads_watcher_service.cc",
     "arc/downloads_watcher/arc_downloads_watcher_service.h",
     "arc/enterprise/arc_enterprise_reporting_service.cc",