Fix showing the sibling menu on mouse move

extensions/shell/browser/shell_screen.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 "extensions/shell/browser/shell_screen.h"
 
 #include <stdint.h>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 55 matching lines @@
 
 gfx::Point ShellScreen::GetCursorScreenPoint() {
   return aura::Env::GetInstance()->last_mouse_location();
 }
 
 bool ShellScreen::IsWindowUnderCursor(gfx::NativeWindow window) {
   return GetWindowAtScreenPoint(GetCursorScreenPoint()) == window;
 }
 
 gfx::NativeWindow ShellScreen::GetWindowAtScreenPoint(const gfx::Point& point) {
-  return host_->window()->GetTopWindowContainingPoint(point);
+  return host_->window()->GetEventHandlerForPoint(point);
 }
 
 display::Display ShellScreen::GetDisplayNearestWindow(
     gfx::NativeWindow window) const {
   return GetPrimaryDisplay();
 }
 
 }  // namespace extensions