Make it possible to build without enable_supervised_users.

chrome/browser/component_updater/component_updater_prefs.cc

Index: chrome/browser/component_updater/component_updater_prefs.cc
diff --git a/chrome/browser/component_updater/component_updater_prefs.cc b/chrome/browser/component_updater/component_updater_prefs.cc
index 7a6604e27c123fa46af74e945bba7171ac82bcf8..bccc32bd1e80732a934469d6b7343a4f00a58a0f 100644
--- a/chrome/browser/component_updater/component_updater_prefs.cc
+++ b/chrome/browser/component_updater/component_updater_prefs.cc
@@ -7,7 +7,11 @@
 #include "chrome/browser/component_updater/chrome_component_updater_configurator.h"
 #include "chrome/browser/component_updater/recovery_component_installer.h"
 #include "chrome/browser/component_updater/recovery_improved_component_installer.h"
+#include "chrome/common/features.h"
+
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
 #include "chrome/browser/component_updater/supervised_user_whitelist_installer.h"
+#endif
 
 namespace component_updater {
 
@@ -15,7 +19,10 @@ void RegisterPrefs(PrefRegistrySimple* registry) {
   RegisterPrefsForChromeComponentUpdaterConfigurator(registry);
   RegisterPrefsForRecoveryComponent(registry);
   RegisterPrefsForRecoveryImprovedComponent(registry);
+
+#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
   SupervisedUserWhitelistInstaller::RegisterPrefs(registry);
+#endif
 }
 
 }  // namespace component_updater