cros: Use runtime stylus detection for ash palette.

ash/common/system/status_area_widget.cc

Index: ash/common/system/status_area_widget.cc
diff --git a/ash/common/system/status_area_widget.cc b/ash/common/system/status_area_widget.cc
index 1fe17f64284d53add21b975cd45565e34177b97b..afb108870bbe0c0a2b4e9896661935412726e61e 100644
--- a/ash/common/system/status_area_widget.cc
+++ b/ash/common/system/status_area_widget.cc
@@ -210,16 +210,13 @@ void StatusAreaWidget::AddLogoutButtonTray() {
 }
 
 void StatusAreaWidget::AddPaletteTray() {
-  if (!IsPaletteFeatureEnabled())
-    return;
-
   const display::Display& display =
       WmLookup::Get()->GetWindowForWidget(this)->GetDisplayNearestWindow();
 
   // Create the palette only on the internal display, where the stylus is
   // available. We also create a palette on every display if requested from the
   // command line.
-  if (display.IsInternal() || IsPaletteEnabledOnEveryDisplay()) {
+  if (display.IsInternal() || palette_utils::IsPaletteEnabledOnEveryDisplay()) {
     palette_tray_ = new PaletteTray(wm_shelf_);
     status_area_widget_delegate_->AddTray(palette_tray_);
   }