Enable settings hardening on OSX when no Finch config is present

chrome/browser/extensions/extension_startup_browsertest.cc

Index: chrome/browser/extensions/extension_startup_browsertest.cc
diff --git a/chrome/browser/extensions/extension_startup_browsertest.cc b/chrome/browser/extensions/extension_startup_browsertest.cc
index e2aa865b415e991ecc3319a13b336b9798337da7..dc4dbd25c646de648c08406bd6685d18a05a330c 100644
--- a/chrome/browser/extensions/extension_startup_browsertest.cc
+++ b/chrome/browser/extensions/extension_startup_browsertest.cc
@@ -67,9 +67,9 @@ class ExtensionStartupTestBase : public InProcessBrowserTest {
           base::StringPrintf(
               "%s/%s/", chrome_prefs::internals::kSettingsEnforcementTrialName,
               chrome_prefs::internals::kSettingsEnforcementGroupNoEnforcement));
-#if defined(OFFICIAL_BUILD) && defined(OS_WIN)
-      // In Windows official builds, it is not possible to disable settings
-      // authentication.
+#if defined(OFFICIAL_BUILD) && (defined(OS_WIN) || defined(OS_MACOSX))
+      // In Windows and MacOS official builds, it is not possible to disable
+      // settings enforcement.
       unauthenticated_load_allowed_ = false;
 #endif
     } else {