Do not coalesce X touch move events in aura.

ui/aura/root_window_host_x11.cc

 // 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.
 
 #include "ui/aura/root_window_host_x11.h"
 
 #include <strings.h>
 #include <X11/cursorfont.h>
 #include <X11/extensions/Xfixes.h>
 #include <X11/extensions/XInput2.h>
@@ skipping 924 matching lines @@
   XEvent* xev = event;
   if (!factory->ShouldProcessXI2Event(xev))
     return;
 
   ui::EventType type = ui::EventTypeFromNative(xev);
   XEvent last_event;
   int num_coalesced = 0;
 
   switch (type) {
     case ui::ET_TOUCH_MOVED:
-      num_coalesced = ui::CoalescePendingMotionEvents(xev, &last_event);
-      if (num_coalesced > 0)
-        xev = &last_event;
-      // fallthrough
     case ui::ET_TOUCH_PRESSED:
     case ui::ET_TOUCH_CANCELLED:
     case ui::ET_TOUCH_RELEASED: {
       ui::TouchEvent touchev(xev);
 #if defined(OS_CHROMEOS)
       if (base::chromeos::IsRunningOnChromeOS()) {
         if (!bounds_.Contains(touchev.location()))
           break;
         // X maps the touch-surface to the size of the X root-window.
         // In multi-monitor setup, Coordinate Transformation Matrix
@@ skipping 134 matching lines @@
   return new RootWindowHostX11(bounds);
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpAuraX11::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura