chromeos: Fix crash when clicking on networking menu under mash

ash/mus/window_manager_application.h

Index: ash/mus/window_manager_application.h
diff --git a/ash/mus/window_manager_application.h b/ash/mus/window_manager_application.h
index a2dde050dcbe02b8c32f1c6bdac45b05ba40d2fc..c9f45656857424019c434765cd59a0698e75f928 100644
--- a/ash/mus/window_manager_application.h
+++ b/ash/mus/window_manager_application.h
@@ -106,6 +106,12 @@ class WindowManagerApplication : public service_manager::Service {
 
   const Config ash_config_;
 
+  // Whether this class initialized NetworkHandler and needs to clean it up.
+  bool network_handler_initialized_ = false;
+
+  // Whether this class initialized DBusThreadManager and needs to clean it up.
+  bool dbus_thread_manager_initialized_ = false;
+
   DISALLOW_COPY_AND_ASSIGN(WindowManagerApplication);
 };