Eliminate quit closure argument to embedded service factories

media/mojo/services/media_service_factory.h

 // Copyright 2016 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.
 
 #ifndef MEDIA_MOJO_SERVICES_MEDIA_SERVICE_FACTORY_H_
 #define MEDIA_MOJO_SERVICES_MEDIA_SERVICE_FACTORY_H_
 
 #include <memory>
 
 #include "base/callback_forward.h"
 #include "media/mojo/services/media_mojo_export.h"
 #include "services/service_manager/public/cpp/service.h"
 
 namespace media {
 
 // Creates a MediaService instance using the default MojoMediaClient on each
 // platform. Uses the TestMojoMediaClient if |enable_test_mojo_media_client| is
 // true.
 std::unique_ptr<service_manager::Service> MEDIA_MOJO_EXPORT
-CreateMediaService(const base::Closure& quit_closure);
+CreateMediaService();
 
 // Creates a MediaService instance using the TestMojoMediaClient.
 std::unique_ptr<service_manager::Service> MEDIA_MOJO_EXPORT
-CreateMediaServiceForTesting(const base::Closure& quit_closure);
+CreateMediaServiceForTesting();
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_SERVICES_MEDIA_SERVICE_FACTORY_H_