Fix stylus tools palette.

ui/events/devices/touchscreen_device.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_DEVICES_TOUCHSCREEN_DEVICE_H_
 #define UI_EVENTS_DEVICES_TOUCHSCREEN_DEVICE_H_
 
 #include <string>
 
 #include "ui/events/devices/events_devices_export.h"
@@ skipping 10 matching lines @@
   TouchscreenDevice(int id,
                     InputDeviceType type,
                     const std::string& name,
                     const gfx::Size& size,
                     int touch_points);
 
   TouchscreenDevice(const InputDevice& input_device,
                     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).
   bool is_stylus;    // True if the specified touchscreen device is stylus
                      // capable.
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_DEVICES_TOUCHSCREEN_DEVICE_H_