x11: Do not listen for XI2 mouse events for X11Window.

ui/platform_window/x11/x11_window.cc

 // Copyright 2014 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/platform_window/x11/x11_window.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ skipping 82 matching lines @@
                     StructureNotifyMask | PropertyChangeMask |
                     PointerMotionMask;
   XSelectInput(xdisplay_, xwindow_, event_mask);
 
   unsigned char mask[XIMaskLen(XI_LASTEVENT)];
   memset(mask, 0, sizeof(mask));
 
   XISetMask(mask, XI_TouchBegin);
   XISetMask(mask, XI_TouchUpdate);
   XISetMask(mask, XI_TouchEnd);
-  XISetMask(mask, XI_ButtonPress);
-  XISetMask(mask, XI_ButtonRelease);
-  XISetMask(mask, XI_Motion);
 
   XIEventMask evmask;
   evmask.deviceid = XIAllDevices;
   evmask.mask_len = sizeof(mask);
   evmask.mask = mask;
   XISelectEvents(xdisplay_, xwindow_, &evmask, 1);
   XFlush(xdisplay_);
 
   ::Atom protocols[2];
   protocols[0] = atom_cache_.GetAtom("WM_DELETE_WINDOW");
@@ skipping 177 matching lines @@
                    &reply_event);
         XFlush(xdisplay_);
       }
       break;
     }
   }
   return POST_DISPATCH_STOP_PROPAGATION;
 }
 
 }  // namespace ui