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 330e45170c75971e71a220fee42d0cfb7f2013b9..2f9ed334a4cb052449fa97752ed0fe7581d18435 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.cc
+++ b/chrome/browser/ui/views/profiles/user_manager_view.cc
@@ -48,6 +48,8 @@ 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