Eliminate quit closure argument to embedded service factories

content/public/common/service_info.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_COMMON_SERVICE_INFO_H_
 #define CONTENT_PUBLIC_COMMON_SERVICE_INFO_H_
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "content/common/content_export.h"
 
 namespace service_manager {
 class Service;
 }
 
 namespace content {
 
 // ServiceInfo provides details necessary to construct and bind new instances
 // of embedded services.
 struct CONTENT_EXPORT ServiceInfo {
   using ServiceFactory =
-      base::Callback<std::unique_ptr<service_manager::Service>(
-          const base::Closure& quit_closure)>;
+      base::Callback<std::unique_ptr<service_manager::Service>()>;
 
   ServiceInfo();
   ServiceInfo(const ServiceInfo& other);
   ~ServiceInfo();
 
   // A factory function which will be called to produce a new Service
   // instance for this service whenever one is needed.
   ServiceFactory factory;
 
   // The task runner on which to construct and bind new Service instances
   // for this service. If null, behavior depends on the value of
   // |use_own_thread| below.
   scoped_refptr<base::SingleThreadTaskRunner> task_runner;
 
   // If |task_runner| is null, setting this to |true| will give each instance of
   // this service its own thread to run on. Setting this to |false| (the
   // default) will instead run the service on the main thread's task runner.
   //
   // If |task_runner| is not null, this value is ignored.
   bool use_own_thread = false;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_SERVICE_INFO_H_