Allow idle/suspend with 3+ monitors attached

ui/display/chromeos/update_display_configuration_task.cc

Index: ui/display/chromeos/update_display_configuration_task.cc
diff --git a/ui/display/chromeos/update_display_configuration_task.cc b/ui/display/chromeos/update_display_configuration_task.cc
index 5fa7ac7f9fb303d72afa24fc5ab02ff590c4203d..db8dffb3aca1f666a985306129beb2ad17a2f052 100644
--- a/ui/display/chromeos/update_display_configuration_task.cc
+++ b/ui/display/chromeos/update_display_configuration_task.cc
@@ -204,7 +204,7 @@ MultipleDisplayState UpdateDisplayConfigurationTask::ChooseDisplayState()
     return state_controller->GetStateForDisplayIds(cached_displays_);
   }
 
-  if (num_on_displays >= 3) {
+  if (num_displays >= 3) {
     // 3+ displays are always extended
     return MULTIPLE_DISPLAY_STATE_MULTI_EXTENDED;
   }