kiosk: Fix kiosk session restart

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index f06a1e5c483865416e641041343ff71cead3c29c..c75399572fc6d06971b770721a749b6a0738cc0b 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -532,7 +532,7 @@ void ChromeBrowserMainPartsChromeos::PreProfileInit() {
 
     user_manager::UserManager* user_manager = user_manager::UserManager::Get();
 
-    if (policy::IsDeviceLocalAccountUser(account_id.GetUserEmail(), NULL) &&
+    if (policy::IsDeviceLocalAccountUser(account_id.GetUserEmail(), nullptr) &&
         !user_manager->IsKnownUser(account_id)) {
       // When a device-local account is removed, its policy is deleted from disk
       // immediately. If a session using this account happens to be in progress,
@@ -662,7 +662,7 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
 
   manager->SetState(session_manager->GetDefaultIMEState(profile()));
 
-  bool is_running_test = parameters().ui_task != NULL;
+  bool is_running_test = parameters().ui_task != nullptr;
   g_browser_process->platform_part()->InitializeSessionManager(
       parsed_command_line(), profile(), is_running_test);
   g_browser_process->platform_part()->SessionManager()->Start();