gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/views/controls/menu/menu_controller.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/views/controls/menu/menu_controller.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 1425 matching lines @@
 
   View* source_view = source->GetScrollViewContainer();
   if (mouse_location.x() >= 0 &&
       mouse_location.x() < source_view->width() &&
       mouse_location.y() >= 0 &&
       mouse_location.y() < source_view->height()) {
     // The mouse is over the menu, no need to continue.
     return false;
   }
 
-  gfx::NativeWindow window_under_mouse =
-      display::Screen::GetScreen()->GetWindowUnderCursor();
   // TODO(oshima): Replace with views only API.
-  if (!owner_ || window_under_mouse != owner_->GetNativeWindow())
+  bool window_under_mouse = display::Screen::GetScreen()->
+                            IsWindowUnderCursor(owner_->GetNativeWindow());

[sky, 2016/05/02 23:01:43]

This crashes if owner_ is null.

+  if (!owner_ || !window_under_mouse)
     return false;
 
   // The user moved the mouse outside the menu and over the owning window. See
   // if there is a sibling menu we should show.
   gfx::Point screen_point(mouse_location);
   View::ConvertPointToScreen(source_view, &screen_point);
   MenuAnchorPosition anchor;
   bool has_mnemonics;
   MenuButton* button = NULL;
   MenuItemView* alt_menu = source->GetMenuItem()->GetDelegate()->
@@ skipping 1213 matching lines @@
     return;
   }
   if (hot_button_)
     hot_button_->SetHotTracked(false);
   hot_button_ = hot_button;
   if (hot_button)
     hot_button->SetHotTracked(true);
 }
 
 }  // namespace views