Make Mandoline shut down cleanly.

components/window_manager/window_manager_app.cc

Index: components/window_manager/window_manager_app.cc
diff --git a/components/window_manager/window_manager_app.cc b/components/window_manager/window_manager_app.cc
index da40ef777090ada1828c3502bbbc97efc500edfc..1324378673bf253a0737bb8ad8d538dfe33bd47c 100644
--- a/components/window_manager/window_manager_app.cc
+++ b/components/window_manager/window_manager_app.cc
@@ -164,6 +164,7 @@ void WindowManagerApp::LaunchViewManager(mojo::ApplicationImpl* app) {
   ApplicationConnection* view_manager_app =
       app->ConnectToApplication("mojo:view_manager");
   view_manager_app->ConnectToService(&view_manager_service_);
+  view_manager_service_.set_error_handler(this);
 
   view_manager_app->AddService<WindowManagerInternal>(this);
 
@@ -205,4 +206,8 @@ void WindowManagerApp::OnAccelerator(mojo::EventPtr event) {
       event->key_data->windows_key_code, event->flags);
 }
 
+void WindowManagerApp::OnConnectionError() {
+  mojo::ApplicationImpl::Terminate();
+}
+
 }  // namespace window_manager