aura: Re-enable XInput2 events.

ui/aura/desktop_host_linux.cc

 // 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.
 
 #include "ui/aura/desktop_host.h"
 
 #include <X11/cursorfont.h>
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
@@ skipping 263 matching lines @@
                                  0, 0, 0);
 
   long event_mask = ButtonPressMask | ButtonReleaseMask |
                     KeyPressMask | KeyReleaseMask |
                     ExposureMask | VisibilityChangeMask |
                     StructureNotifyMask | PropertyChangeMask |
                     PointerMotionMask;
   XSelectInput(xdisplay_, xwindow_, event_mask);
   XFlush(xdisplay_);
 
-  // TODO(sadrul): reenable once 103981 is fixed.
-#if defined(TOUCH_UI)
   if (base::MessagePumpForUI::HasXInput2())
     ui::TouchFactory::GetInstance()->SetupXI2ForXWindow(xwindow_);
-#endif
 }
 
 DesktopHostLinux::~DesktopHostLinux() {
   XDestroyWindow(xdisplay_, xwindow_);
 
   // Clears XCursorCache.
   ui::GetXCursor(ui::kCursorClearXCursorCache);
 }
 
 base::MessagePumpDispatcher::DispatchStatus DesktopHostLinux::Dispatch(
@@ skipping 206 matching lines @@
   return new DesktopHostLinux(bounds);
 }
 
 // static
 gfx::Size DesktopHost::GetNativeDisplaySize() {
   ::Display* xdisplay = base::MessagePumpX::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura