Don't track mouse events in HWNDMessageHandler when they are forwarded by the LegacyRenderWidgetHost

ui/views/controls/menu/menu_controller.cc

Index: ui/views/controls/menu/menu_controller.cc
===================================================================
--- ui/views/controls/menu/menu_controller.cc	(revision 250790)
+++ ui/views/controls/menu/menu_controller.cc	(working copy)
@@ -2130,9 +2130,8 @@
   gfx::Screen* screen = gfx::Screen::GetScreenFor(native_view);
   gfx::NativeWindow window = screen->GetWindowAtScreenPoint(screen_loc);
 
-  if (!window)
-    return;
-
+  // On Windows, it is ok for window to be NULL. Please refer to the
+  // RepostLocatedEvent function for more information.
 #if defined(OS_WIN)
   // Release the capture.
   SubmenuView* submenu = state_.item->GetRootMenuItem()->GetSubmenu();
@@ -2149,6 +2148,9 @@
       return;
     }
   }
+#else
+  if (!window)
+    return;
 #endif
 
   scoped_ptr<ui::LocatedEvent> clone;