Fixing: ui::IsTouchDevicePresent() doesn't respect --touch-devices flag

ui/events/x/touch_factory_x11.h

 // Copyright (c) 2012 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_X_TOUCH_FACTORY_X11_H_
 #define UI_EVENTS_X_TOUCH_FACTORY_X11_H_
 
 #include <bitset>
 #include <map>
 #include <set>
@@ skipping 103 matching lines @@
 
   static const int kMaxDeviceNum = 128;
 
   // A quick lookup table for determining if events from the pointer device
   // should be processed.
   std::bitset<kMaxDeviceNum> pointer_device_lookup_;
 
   // A quick lookup table for determining if a device is a touch device.
   std::bitset<kMaxDeviceNum> touch_device_lookup_;
 
-  // Indicates whether a touch device is currently available or not.
-  bool touch_device_available_;
-
   // Indicates whether touch events are explicitly disabled.
   bool touch_events_disabled_;
 
   // The list of touch devices. For testing/debugging purposes, a single-pointer
   // device (mouse or touch screen without sufficient X/driver support for MT)
   // can sometimes be treated as a touch device. The key in the map represents
   // the device id, and the value represents if the device is multi-touch
   // capable.
   std::map<int, bool> touch_device_list_;
 
@@ skipping 14 matching lines @@
   int virtual_core_keyboard_device_;
 
   SequentialIDGenerator id_generator_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_X_TOUCH_FACTORY_X11_H_