MDUserManager: ignore pref toggles for adding a profile and browsing as guest.

chrome/browser/ui/webui/signin/user_manager_screen_handler.cc

Index: chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
diff --git a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
index 3bb6039a2f000e0e4038246dd2103de5e93d06eb..937e2ff6440218355cf2444f12e54840ef31240d 100644
--- a/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
+++ b/chrome/browser/ui/webui/signin/user_manager_screen_handler.cc
@@ -140,12 +140,16 @@ extensions::ScreenlockPrivateEventRouter* GetScreenlockRouter(
 }
 
 bool IsGuestModeEnabled() {
+  if (switches::IsMaterialDesignUserManager())
+    return true;
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   return service->GetBoolean(prefs::kBrowserGuestModeEnabled);
 }
 
 bool IsAddPersonEnabled() {
+  if (switches::IsMaterialDesignUserManager())
+    return true;
   PrefService* service = g_browser_process->local_state();
   DCHECK(service);
   return service->GetBoolean(prefs::kBrowserAddPersonEnabled);