Mac - show user manager before opening browser.

chrome/browser/ui/views/profiles/user_manager_view.cc

Index: chrome/browser/ui/views/profiles/user_manager_view.cc
diff --git a/chrome/browser/ui/views/profiles/user_manager_view.cc b/chrome/browser/ui/views/profiles/user_manager_view.cc
index 3de57aa69d67b530b99fb7b9c1d07f8fd47f2280..11e85c446331a12cb5bacf13fed23c2f77e309c1 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.cc
+++ b/chrome/browser/ui/views/profiles/user_manager_view.cc
@@ -46,6 +46,8 @@ void UserManager::Show(
     const base::FilePath& profile_path_to_focus,
     profiles::UserManagerTutorialMode tutorial_mode,
     profiles::UserManagerProfileSelected profile_open_action) {
+  DCHECK(profile_path_to_focus != ProfileManager::GetGuestProfilePath());
+
   ProfileMetrics::LogProfileSwitchUser(ProfileMetrics::OPEN_USER_MANAGER);
   if (instance_) {
     // If we are showing the User Manager after locking a profile, change the