touch: Always expect XInput2 availability.

ui/views/focus/accelerator_handler.h

 // Copyright (c) 2011 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_VIEWS_FOCUS_ACCELERATOR_HANDLER_H_
 #define UI_VIEWS_FOCUS_ACCELERATOR_HANDLER_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include <gdk/gdk.h>
 #endif
 
 #include <set>
 #include <vector>
 
 #include "base/message_loop.h"
 
 namespace ui {
 
 #if defined(TOUCH_UI)
 // Dispatch an XEvent to the RootView. Return true if the event was dispatched
 // and handled, false otherwise.
 bool DispatchXEvent(XEvent* xevent);
 
-#if defined(HAVE_XINPUT2)
 // Keep a list of touch devices so that it is possible to determine if a pointer
 // event is a touch-event or a mouse-event.
 void SetTouchDeviceList(std::vector<unsigned int>& devices);
-#endif  // HAVE_XINPUT2
 #endif  // TOUCH_UI
 
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratorHandler class
 //
 //  An object that pre-screens all UI messages for potential accelerators.
 //  Registered accelerators are processed regardless of focus within a given
 //  Widget or Window.
 //
 //  This processing is done at the Dispatcher level rather than on the Widget
@@ skipping 20 matching lines @@
   // The keys currently pressed and consumed by the FocusManager.
   std::set<WPARAM> pressed_keys_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorHandler);
 };
 
 }  // namespace ui
 
 #endif  // UI_VIEWS_FOCUS_ACCELERATOR_HANDLER_H_