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

mash/wm/window_manager_application.cc

 // Copyright 2015 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 "mash/wm/window_manager_application.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "components/mus/public/cpp/event_matcher.h"
@@ skipping 109 matching lines @@
 }
 
 bool WindowManagerApplication::AcceptConnection(mojo::Connection* connection) {
   connection->AddInterface<mash::wm::mojom::UserWindowController>(this);
   connection->AddInterface<mus::mojom::AcceleratorRegistrar>(this);
   if (connection->GetRemoteIdentity().name() == "mojo:mash_session")
     connection->GetInterface(&session_);
   return true;
 }
 
+void WindowManagerApplication::ShellConnectionLost() {
+  _exit(1);
+}
+
 void WindowManagerApplication::Create(
     mojo::Connection* connection,
     mojo::InterfaceRequest<mash::wm::mojom::UserWindowController> request) {
   if (!root_controllers_.empty() && (*root_controllers_.begin())->root()) {
     user_window_controller_binding_.AddBinding(user_window_controller_.get(),
                                                std::move(request));
   } else {
     user_window_controller_requests_.push_back(make_scoped_ptr(
         new mojo::InterfaceRequest<mash::wm::mojom::UserWindowController>(
             std::move(request))));
@@ skipping 20 matching lines @@
 
 void WindowManagerApplication::CreateWindowManager(
     mus::mojom::DisplayPtr display,
     mojo::InterfaceRequest<mus::mojom::WindowTreeClient> client_request) {
   root_controllers_.insert(RootWindowController::CreateFromDisplay(
       this, std::move(display), std::move(client_request)));
 }
 
 }  // namespace wm
 }  // namespace mash