Revert of Update AuraInit to handle failed initialization

ash/mus/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 "ash/mus/window_manager_application.h"
 
 #include <utility>
 
 #include "ash/mojo_interface_factory.h"
 #include "ash/mus/network_connect_delegate_mus.h"
@@ skipping 111 matching lines @@
   bluez::BluezDBusManager::Shutdown();
   if (dbus_thread_manager_initialized_)
     chromeos::DBusThreadManager::Shutdown();
   message_center::MessageCenter::Shutdown();
 }
 
 void WindowManagerApplication::OnStart() {
   mojo_interface_factory::RegisterInterfaces(
       &registry_, base::ThreadTaskRunnerHandle::Get());
 
-  aura_init_ = views::AuraInit::Create(
+  aura_init_ = base::MakeUnique<views::AuraInit>(
       context()->connector(), context()->identity(), "ash_mus_resources.pak",
       "ash_mus_resources_200.pak", nullptr,
       views::AuraInit::Mode::AURA_MUS_WINDOW_MANAGER);
-  if (!aura_init_) {
-    context()->QuitNow();
-    return;
-  }
   window_manager_ = base::MakeUnique<WindowManager>(
       context()->connector(), ash_config_, show_primary_host_on_connect_);
 
   std::unique_ptr<aura::WindowTreeClient> window_tree_client =
       base::MakeUnique<aura::WindowTreeClient>(
           context()->connector(), window_manager_.get(), window_manager_.get());
   const bool automatically_create_display_roots = false;
   window_tree_client->ConnectAsWindowManager(
       automatically_create_display_roots);
 
   const bool init_network_handler = true;
   InitWindowManager(std::move(window_tree_client), init_network_handler);
 }
 
 void WindowManagerApplication::OnBindInterface(
     const service_manager::BindSourceInfo& source_info,
     const std::string& interface_name,
     mojo::ScopedMessagePipeHandle interface_pipe) {
   registry_.BindInterface(source_info, interface_name,
                           std::move(interface_pipe));
 }
 
 }  // namespace mus
 }  // namespace ash