Quit the message loop by default in ShellConnectionLost when ApplicationRunner is used

components/mus/mus_app.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/mus_app.h"
 
 #include <set>
 
 #include "base/memory/weak_ptr.h"
 #include "base/stl_util.h"
@@ skipping 150 matching lines @@
 bool MandolineUIServicesApp::AcceptConnection(Connection* connection) {
   connection->AddInterface<Gpu>(this);
   connection->AddInterface<mojom::DisplayManager>(this);
   connection->AddInterface<mojom::UserAccessManager>(this);
   connection->AddInterface<WindowTreeHostFactory>(this);
   connection->AddInterface<mojom::WindowManagerFactoryService>(this);
   connection->AddInterface<mojom::WindowTreeFactory>(this);
   return true;
 }
 
-void MandolineUIServicesApp::ShellConnectionLost() {
-  // TODO: This should exit cleanly.
-  _exit(1);
-}
-
 void MandolineUIServicesApp::OnFirstDisplayReady() {
   PendingRequests requests;
   requests.swap(pending_requests_);
   for (auto& request : requests)
     Create(request->connection, std::move(*request->wtf_request));
 }
 
 void MandolineUIServicesApp::OnNoMoreDisplays() {
   base::MessageLoop::current()->QuitWhenIdle();
 }
@@ skipping 68 matching lines @@
   user_state->window_tree_host_factory->AddBinding(std::move(request));
 }
 
 void MandolineUIServicesApp::Create(mojo::Connection* connection,
                                     mojom::GpuRequest request) {
   DCHECK(platform_display_init_params_.gpu_state);
   new GpuImpl(std::move(request), platform_display_init_params_.gpu_state);
 }
 
 }  // namespace mus