Send fake event when event_type is set to exit menu

ui/aura/desktop_host_win.cc

Index: ui/aura/desktop_host_win.cc
diff --git a/ui/aura/desktop_host_win.cc b/ui/aura/desktop_host_win.cc
index c491ac161a9b0b56165e85236723d443954ff7e5..36399e2da5e38ceaaf6499eb2390d28ea92b62f2 100644
--- a/ui/aura/desktop_host_win.cc
+++ b/ui/aura/desktop_host_win.cc
@@ -225,6 +225,11 @@ gfx::Point DesktopHostWin::QueryMouseLocation() {
                     max(0, min(size.height(), static_cast<int>(pt.y))));
 }
 
+void DesktopHostWin::PostNativeEvent(const base::NativeEvent& native_event) {
+  ::PostMessage(
+      hwnd(), native_event.message, native_event.wParam, native_event.lParam);
+}
+
 void DesktopHostWin::OnClose() {
   // TODO: this obviously shouldn't be here.
   MessageLoopForUI::current()->Quit();