[Night Light] Accessibility: Make ChromeVox speak button status on toggles

ash/system/tiles/tiles_default_view.cc

Index: ash/system/tiles/tiles_default_view.cc
diff --git a/ash/system/tiles/tiles_default_view.cc b/ash/system/tiles/tiles_default_view.cc
index 9b5bd504509d474549c91a21d834fd1ebf54aaa1..efa58bd938ad4691e5efdece701de93ad379bd98 100644
--- a/ash/system/tiles/tiles_default_view.cc
+++ b/ash/system/tiles/tiles_default_view.cc
@@ -126,8 +126,7 @@ void TilesDefaultView::ButtonPressed(views::Button* sender,
   } else if (NightLightController::IsFeatureEnabled() &&
              sender == night_light_button_) {
     Shell::Get()->metrics()->RecordUserMetricsAction(UMA_TRAY_NIGHT_LIGHT);
-    Shell::Get()->night_light_controller()->Toggle();
-    night_light_button_->Update();
+    night_light_button_->Toggle();
   } else if (sender == lock_button_) {
     Shell::Get()->metrics()->RecordUserMetricsAction(UMA_TRAY_LOCK_SCREEN);
     chromeos::DBusThreadManager::Get()