Revert 233414 "x11: Move XInput2 availability information out of..."

trunk/src/ui/events/x/device_data_manager.h

 // Copyright 2013 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_DEVICE_DATA_MANAGER_H_
 #define UI_EVENTS_X_DEVICE_DATA_MANAGER_H_
 
 #include <X11/extensions/XInput2.h>
 
 #include <bitset>
@@ skipping 85 matching lines @@
 
   // Returns the DeviceDataManager singleton.
   static DeviceDataManager* GetInstance();
 
   // Natural scroll setter/getter.
   bool natural_scroll_enabled() const { return natural_scroll_enabled_; }
   void set_natural_scroll_enabled(bool enabled) {
     natural_scroll_enabled_ = enabled;
   }
 
-  // Returns if XInput2 is available on the system.
-  bool IsXInput2Available() const;
-
   // Get the natural scroll direction multiplier (1.0f or -1.0f).
   float GetNaturalScrollFactor(int sourceid) const;
 
   // Updates the list of devices.
   void UpdateDeviceList(Display* display);
 
   // For multitouch events we use slot number to distinguish touches from
   // different fingers. This function returns true if the associated slot
   // for |xiev| can be found and it is saved in |slot|, returns false if
   // no slot can be found.
@@ skipping 162 matching lines @@
 
   unsigned char button_map_[256];
   int button_map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_X_DEVICE_DATA_MANAGER_H_