ash: Remove broken display notification suppression when settings is open

ash/common/test/test_system_tray_delegate.cc

Index: ash/common/test/test_system_tray_delegate.cc
diff --git a/ash/common/test/test_system_tray_delegate.cc b/ash/common/test/test_system_tray_delegate.cc
index 4c7f58f4ce377963aed6118a8d27e2608766eae3..a40c227789b65d66b6c76f8ba5b8b14b75730a27 100644
--- a/ash/common/test/test_system_tray_delegate.cc
+++ b/ash/common/test/test_system_tray_delegate.cc
@@ -23,9 +23,7 @@ LoginStatus g_initial_status = LoginStatus::USER;
 }  // namespace
 
 TestSystemTrayDelegate::TestSystemTrayDelegate()
-    : should_show_display_notification_(false),
-      login_status_(g_initial_status),
-      session_length_limit_set_(false) {}
+    : login_status_(g_initial_status), session_length_limit_set_(false) {}
 
 TestSystemTrayDelegate::~TestSystemTrayDelegate() {}
 
@@ -91,10 +89,6 @@ void TestSystemTrayDelegate::GetSystemUpdateInfo(UpdateInfo* info) const {
   info->factory_reset_required = false;
 }
 
-bool TestSystemTrayDelegate::ShouldShowDisplayNotification() {
-  return should_show_display_notification_;
-}
-
 bool TestSystemTrayDelegate::GetSessionStartTime(
     base::TimeTicks* session_start_time) {
   // Just returns TimeTicks::Now(), so the remaining time is always the