cros: Use runtime stylus detection for ash palette.

ash/laser/laser_pointer_controller.cc

Index: ash/laser/laser_pointer_controller.cc
diff --git a/ash/laser/laser_pointer_controller.cc b/ash/laser/laser_pointer_controller.cc
index 3559bad40e6c381fb8839302ac29236b151b61bd..e979549d70281e9299c140dcda8a25e91ac058ed 100644
--- a/ash/laser/laser_pointer_controller.cc
+++ b/ash/laser/laser_pointer_controller.cc
@@ -70,7 +70,7 @@ void LaserPointerController::OnTouchEvent(ui::TouchEvent* event) {
   // Start a new laser session if the stylus is pressed but not pressed over the
   // palette.
   if (event->type() == ui::ET_TOUCH_PRESSED &&
-      !PaletteContainsPointInScreen(event_location)) {
+      !palette_utils::PaletteContainsPointInScreen(event_location)) {
     DestroyLaserPointerView();
     UpdateLaserPointerView(current_window, event_location, event);
   }