[Views] Make MenuButton track its desired state while pressed

ui/views/widget/desktop_aura/desktop_native_widget_aura.cc

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
index 88c60906b7268d02bffd85fdb683ef05c9bca77a..2e1acca58af6e8eb3d3c65d97970986fb5d14cbc 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.cc
@@ -870,7 +870,10 @@ void DesktopNativeWidgetAura::SetCursor(gfx::NativeCursor cursor) {
 }
 
 bool DesktopNativeWidgetAura::IsMouseEventsEnabled() const {
-  if (!content_window_)
+  // We explicitly check |host_| here because it can be null during the process
+  // of widget shutdown (even if |content_window_| is not), and must be valid to
+  // determine if mouse events are enabled.
+  if (!content_window_ || !host_)
     return false;
   aura::client::CursorClient* cursor_client =
       aura::client::GetCursorClient(host_->window());