Fix a regression in checking the status of the touch events.

ui/events/devices/x11/touch_factory_x11.h

Index: ui/events/devices/x11/touch_factory_x11.h
diff --git a/ui/events/devices/x11/touch_factory_x11.h b/ui/events/devices/x11/touch_factory_x11.h
index eb2620b3c89e70bfa58ac842731c6b57307ec825..1f113eaf78e96800cfa3c23fec357828c912be8f 100644
--- a/ui/events/devices/x11/touch_factory_x11.h
+++ b/ui/events/devices/x11/touch_factory_x11.h
@@ -137,6 +137,9 @@ class EVENTS_DEVICES_EXPORT TouchFactory {
   // Associate each device ID with its master device ID.
   std::map<int, int> device_master_id_list_;
 
+  // Indicates whether touch events are explicitly disabled.
+  bool touch_events_disabled_;
+
   DISALLOW_COPY_AND_ASSIGN(TouchFactory);
 };