Fix stylus tools palette.

ui/events/devices/touchscreen_device.h

Index: ui/events/devices/touchscreen_device.h
diff --git a/ui/events/devices/touchscreen_device.h b/ui/events/devices/touchscreen_device.h
index 2aa22a6a079e2fa98ddc2a5843b572d52267b5c6..ee024a0f860f35f0d3cd2fb53a96a6689e0d6be2 100644
--- a/ui/events/devices/touchscreen_device.h
+++ b/ui/events/devices/touchscreen_device.h
@@ -28,6 +28,8 @@ struct EVENTS_DEVICES_EXPORT TouchscreenDevice : public InputDevice {
                     const gfx::Size& size,
                     int touch_points);
 
+  ~TouchscreenDevice() override;
+
   gfx::Size size;    // Size of the touch screen area.
   int touch_points;  // The number of touch points this device supports (0 if
                      // unknown).