Keep the mouse cursor within desktop

ui/aura/root_window.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.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 370 matching lines @@
 
   if (capture_window_) {
     // Make all subsequent mouse events and touch go to the capture window. We
     // shouldn't need to send an event here as OnCaptureLost should take care of
     // that.
     if (mouse_moved_handler_ || mouse_button_flags_ != 0)
       mouse_moved_handler_ = capture_window_;
   } else {
     // When capture is lost, we must reset the event handlers.
     mouse_moved_handler_ = NULL;
-
-    host_->UnConfineCursor();
   }
   mouse_pressed_handler_ = NULL;
 }
 
 void RootWindow::ReleaseCapture(Window* window) {
   if (capture_window_ != window)
     return;
   SetCapture(NULL);
 }
 
@@ skipping 467 matching lines @@
 void RootWindow::UnlockCompositor() {
   DCHECK(compositor_lock_);
   compositor_lock_ = NULL;
   if (draw_on_compositor_unlock_) {
     draw_on_compositor_unlock_ = false;
     ScheduleDraw();
   }
 }
 
 }  // namespace aura