Support base::Feature entries in chrome://flags.

chrome/browser/profiles/profile_window.cc

Index: chrome/browser/profiles/profile_window.cc
diff --git a/chrome/browser/profiles/profile_window.cc b/chrome/browser/profiles/profile_window.cc
index 4d01ff6dd3833fe83aa665013b9fbecbf163d9ba..ddf9c59760614b6b89e93c877c95b88ce56c2da8 100644
--- a/chrome/browser/profiles/profile_window.cc
+++ b/chrome/browser/profiles/profile_window.cc
@@ -477,10 +477,10 @@ void EnableNewProfileManagementPreview(Profile* profile) {
       switches::kEnableNewProfileManagement,
       "",  // not used with ENABLE_DISABLE_VALUE type
       switches::kDisableNewProfileManagement,
-      "",  // not used with ENABLE_DISABLE_VALUE type
-      NULL,  // not used with ENABLE_DISABLE_VALUE type
-      3
-  };
+      "",       // not used with ENABLE_DISABLE_VALUE type
+      nullptr,  // not used with ENABLE_DISABLE_VALUE type
+      nullptr,  // not used with ENABLE_DISABLE_VALUE type
+      3};
   flags_ui::PrefServiceFlagsStorage flags_storage(
       g_browser_process->local_state());
   about_flags::SetFeatureEntryEnabled(&flags_storage, entry.NameForChoice(1),